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The only vehicles that actually have and use bases for measurements are walkers like Dreadnoughts and Sentinels. Skimmers with flying stands use the skimmer itself for LOS and Range measurments, not the edge of the flying stand, as that opens up the ridiculous can of worms that allows my Hammerhead to shoot at you from around corners while being untargetable.

A scant few million years after the birth of the stars, the Necrontyr race clung to their short lives from the radiation scourging of their massive and violent star. The Necrontyr spent aeons expanding their technology in an attempt to extend their lives. They used slow-burning tomb ships, full of cryogenically frozen Necrontyr to populate the stars. When they encountered the Old Ones, the other sentient race of the Galaxy at the time, the Necrontyr were angered to learn that the Old Ones were practically immortal. The Necrontyr started a war against the Old Ones to exterminate them as a reminder of their own failings. When it came down to a war between the Old Ones psychic abilities and mastery of the webway portals, and the Necrontyr's technology, the Necrontyr lost, and were almost exterminated. In a desperate attempt to survive, one of the Necrontyr scientists noticed that there were strange readings over the homeworld's star. The C'tan had been discovered.

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The Necrontyr
Main article: Necrontyr
Not a lot is known about the origins or the natural history of the ancient race known as the Necrontyr. They seem to be one of the earliest sentient races in the galaxy. What little that is known portrays a bitter race, confined to their homeworld and cursed by drastically short lifespans due to a perilously close orbit around their sun.

The Necrontyr were desperate to free themselves from their tortured lives, and dedicated their scientific advance to two endeavours: studying their sun in search of a defence against its wrath, and planning an escape to another, more hospitable world.

The Necrons' story is one of an ancient betrayal. Aeons ago, the Necrontyr race clung to their short lives in fear of oblivion at the hands of their massive and ravaging star. They pushed the limits of science in an effort to lengthen their lives, but to no avail. Then, the star gods known as the C'tan were discovered, offering immortality at a terrible price.

The Necrontyr agreed, and their souls were encased in living metal bodies. What they did not know was that the process dulled their minds and senses so they became slaves of the C'tan. The C'tan needed warrior-slaves to harvest the life forms of the galaxy so the star gods could feast on souls, and the C'tan's new Necrons served this purpose well.

After life across the galaxy ran thin millions of years ago, the Necrons went into stasis, waiting for life to grow back. Now, in the 41st millennium, they have found a galaxy teeming with life again. (The Necrons also went into stasis because of the enslavers. The enslavers were devouring the c'tans food source. In the 41st millennium the enslavers are rare and are no longer considered a threat to the c'tan. see below)

In combat, the Necrons are unyielding war machines that bring swift death to their prey. Armed with gauss weapons that strip an opponent's molecules one layer at a time, the Necrons have fierce firepower. Also, they have a remarkable ability to repair themselves, a special rule known as We'll Be Back! This gives the Necrons incredible staying power in a battle, which makes them an enemy dreaded by all races in the world of Warhammer 40,000.

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Necrodermis
Main article: Necrodermis
The living metal developed by the ancient and long dead Necrontyr, originally invented for use in constructing their ships. It is a metallic substance that appears to grow and heal as if it were part of a living organism.




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The C'Tan
Main article: C'tan
The scientists studying the Necrontyr home star had discovered a being of incredible power feeding off its massive energy output. The full weight of Necrontyr science was put behind detailing this discovery, and realising the potential implications such an incredible power might have on the war against the Old Ones. It was not long before other similar beings were discovered, and they were collectively called the C'tan, literally "Star Gods" in the language of the Necrontyr.

The scientists at last managed to communicate with the beings using signals many years long - long enough to be noticed by such a high level of sentience. Using new technologies of living metal, the Necrontyr crafted material bodies for the star vampires, and they invited the C'tan to possess and animate their new material forms.

As the awesome power of the C'tan became material, the Necrontyr began to see these new beings not as guests, but as gods. This suited the C'tan well, as in their material forms they had discovered a new delicacy to absorb that of the living soul, and the flow of power from the Necrontyr towards their new gods was a welcome thrill.

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Transformation
When told of the Necrontyr's troubled existence, and their struggled war against the Old Ones, the C'tan were quick to formulate a plan. Using their mastery of physics, the C'tan would fashion new, immortal bodies for the Necrontyr, forged from a living metal similar to that which the C'tan material bodies were composed of. This way the Necrontyr would get their prize of immortality, and would become an unstoppable force against the Old Ones.

Of course, the C'tan had a hidden agenda. As the Necrontyr entered their immortal bodies, their living essence would escape them, to be easily lapped up by their hungry gods.

In one swift action, the entire Necrontyr race was effectively destroyed, replaced with legions of skeletal robots, who lost the last dregs of their individuality shortly after their transformation. Only a bitter hatred of the living remained. These new beings, from then on known as Necrons, were the ideal minions for the C'tan, and served only to herd the star-gods' cattle, so that they could feed on all life in the galaxy.

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The Enslavers
Main article: Enslavers (Warhammer 40,000)
During the terrible wars between the C'tan and the Old Ones that followed the grave birth of the Necrons, the Enslavers poured forth into the galaxy, and caused the deaths of many billions of lives. The C'tan, beings of pure physical energy, had no understanding of the Warp, and the onslaught of psychic beings was something they had no ability to oppose. Of course, the Enslavers posed no direct threat to the Necrons or the C'tan, but they were killing the C'tan's cattle in droves, and the star gods and their legions were forced into hiding to wait out this plague.

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Awakening
Now, many millions of years after the Enslaver plague, the Necrons and their masters finally awaken to reclaim their galaxy, and begin once again to herd the living as their cattle. The deathly silent ranks of the Necrons stalk forth across countless worlds, to reassert their masters' rule, and once again inspire fear into the living.

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The Necrons in the 41st Millennium
Today, the Necrons are still a shadowy presence rather than a full-fledged force. They strike out of nowhere without warning, wreak havoc and leave before any major reinforcements can arrive. The origins of the various attacks and their motives are unknown. Not a single Necron could be captured for inspection yet; entire Necron forces simply vanish into the air without a trace and take their dead with them.

Nowhere in the galaxy is beyond the reach of the Necrons, as demonstrated by the Mars incident, where five Necron starships passed through the considerable Imperial fleet guarding the Solar System undetected. They were already in the low orbit of Mars by the time the planetary defenses of the Adeptus Mechanicus homeworld could finally register the attack. Although four of the Necron ships were destroyed, the final one managed to land and deliver its unknown content. The fact that five ships managed to penetrate one of the most heavily guarded planets in the heart of the Imperium has dire implications about the previously undoubted impregnability of Holy Terra itself, so this incident is one of the tightly guarded secrets of the Imperium.

What actually happens is that Necron forces strike out of various uncharted tomb-worlds, using their phase technology to rapidly deploy their forces anywhere in the galaxy. When defeated, they simply "phase-out" and return to the tomb-world for repairs. Every Necron fallen in battle can be repaired and re-animated in a tomb-world, so they never actually sustain casualties (although it is possible to destroy these complexes). With more and more Necron awakening from their millennia-long slumber, they are apt to pose a great threat to the whole galaxy.

Other than their military assaults, the Necrons have infiltrated the Imperium to an unknown extent. Their elite anti-psyker troops, the Pariah, are a cross-breed with human genes and it is yet unknown if the Necrons developed the Pariah project by themselves or with the help of Imperial traitors (or possibly even Adeptus Mechanicus). But it is known that the C'tan had the Pariah Gene placed in the human genepool several million years ago. This has since manifested itself in the agents of the Culexus temple, specialist anti-psyker assassins.

Necrons are effectively the souls/consciousnesses of sentient beings (the Necrontyr) trapped in advanced "liquid-state" metallic robotic bodies. Due to being of an extremely high technological level (possibly millions of years ahead of humanity), they are relatively unaffected by conventional EMP weaponry. Whether this is due to radiation shielding or non-electronic components is not currently known. They apparently use portable power cores and teleporters (apparently made up of a greenish crystalline substance) for each Necron soldier.

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Necron Forces & Weaponry
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Necron Characteristics
Necrons are a 'dead' race, forged by the ancient Necrontyr (whose essence is now contained within Necrons) and their Star Gods. Most Necrons are tall, skeletal figures made of living metal. This metal provides excellent protection in battle, but also has the special self-repair effect, termed We'll Be Back, which allows each Necron soldier to "heal" at a rapid rate- so rapid, in fact, that even a seriously damaged soldier will be able to quickly rejoin the battle. Curiously, this ability seems to only work when the Necron is in the vicinity of other Necrons of the same type.

Another interesting phenomenon is that when a battle has turned strongly against the Necrons, the entire army will simply vanish from the battlefield. Even 'dead' Necrons (those who have not repaired enough to rejoin the fight) and Necrons engaged in close combat will disappear along with the rest of the army, leaving behind their astonished foes. Because of this, enemy forces like the Imperium have had great difficulty in obtaining Necron artifacts or "corpses" to study.

It should be noted that the terms for the weapons and Necrons that follow are given to them by their opponents, not the Necrons themselves. Aside from the C'tan, the Necrons never communicate to non-Necrons; the C'tan known as the Deceiver has been observed infrequently communicating with non-Necrons.

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Gauss Weapons
The most common Necron weapons are dreadful devices known as Gauss weapons, which, although similarly named, are not at all like modern gauss technology. While their inner workings are beyond technological understanding, they seem to work at the molecular level, rapidly stripping a target down to its constituent atoms. This has a horrifying effect upon living organisms, quickly and painfully tearing them apart; but the weapon also makes short work of even the armor on armored vehicles, such as tanks.

Gauss weapons come in many variants:

Gauss Flayer: Standard equipment for Necron Warriors, Gauss Flayers are long-barreled rifles with an axe attached to their tip. Their most striking feature is a transparent tube running the length of the barrel, with green arcs of unearthly energy crackling within.
Gauss Blaster: Gauss Blasters closely resemble double-barreled Flayers; they are heavier and more powerful.
Gauss Cannon: A heavy Gauss weapon, Gauss Cannons are mounted on agile Necron Destroyers. They exhibit greater ability to penetrate enemy armor than even a Blaster or Flayer, and a single blast can be quite fatal to even the toughest foes.
Heavy Gauss Cannon: An extremely heavy, anti-vehicle variant of Gauss Cannon. They are mounted on Heavy Destroyers, and can penetrate even the heaviest armor with ease.
Gauss Flux Arc: Mounted on Necron Monoliths for close-range fire support, the multi-barreled Gauss Flux Arc is essentially a system of short-ranged Blasters which activates to destroy any enemies who stray too close.
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Other Weapons
While most weapons used by Necrons are gauss weapons, they also possess some non-Gauss weapons, but these are far less common, frequently carried by more specialist troops.

Staff of Light: Carried by Necron Lords both as both a symbol of rank and a formidable weapon, the Staff of Light can shoot devastating, short-ranged energy blasts. It can also be wielded as a close combat weapon by the Necron Lord and functions similar to a power weapon.
Warscythe: One of the most powerful close combat weapons in the galaxy, Warscythes are made of Necrodermis and imbued with phase technology. A Warscythe can cut through anything, even force fields or heavy tank armor, and is therefore a very powerful weapon in the hands of a skilled wielder. Warscythes are sometimes wielded by Necron Lords instead of a Staff of Light, while Pariahs carry even deadlier variants with built-in Gauss Blasters.
Particle Projector: Sometimes mounted on Tomb Spyders, the Particle Projector fires blasts of energy similar to a Staff of Light.
Particle Whip: The primary weapon of Necron Monoliths, the Particle Whip is a very powerful weapon indeed. The weapon fires a focused particle beam which unleashes a very powerful bolt of energy. The result is a deadly energy blast, although the beam itself is equally dangerous to whomever it strikes.
Particle Accelerator: The primary weapon of the Necron Pylons, which are defensive constructions (also made of the Necron living metal) used to defend the tomb worlds they are on, these are used to fire highly explosive balls of energy from a long distance to destroy their enemies, even those which have not yet landed on the planet being defended.
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Necron Units
Necron Lord: Necron Lords are the commanders of Necron forces. They are formidable foes on the battlefield, being quite adept with both ranged and close combat weaponry. Due to their special position as "leaders" in the Necron forces, they are often equipped with special gear. This gear often increases the effectiveness of other Necrons around the Lord, such as augmenting their healing factor, or allowing them to teleport to crucial points in a battle; other gear carried can increase the Lord's survivability or his prowess in battle.

Necron Warriors wielding Gauss Flayers and with some Scarabs at their feetWarrior: Necron Warriors are the backbone of the Necron army. They are numerous and provide strong fire support with their Gauss Flayers. Their 'living metal' bodies allow them to sustain massive damage and continue functioning- especially considering their "We'll Be Back" healing factor.
Pariah: Pariahs represent the true horror of a Necron-ruled galaxy. They are created by fusing Necron technology with human victims who bear the "pariah gene" (a rare and unusual genetic defect with which the bearer lacks a soul). Each Pariah is a formidable warrior, especially since they wield deadly warscythes; but they also radiate an unnatural aura which can have a severe unnerving effect upon their enemies, especially psykers. Interestingly, since Pariahs are partly human, they lack the incredible healing factor that most other Necrons have.
Immortal: Those favored Necrontyr who were among the first to give up their flesh and embrace the metal were rewarded by being Immortals. They are more durable, heavy variants of the Warrior and they wield Gauss Blasters.
Flayed One: Flayed Ones are Necrons who retain some of their original consciousness and have been driven mad by their ageless imprisonment. They are quite capable melee fighters, with claws and blades that can flay a man alive in seconds. They usually adorn themselves with still wet pieces of skin and hide from their latest victims. In such a state, they are a terrifying sight to behold, so much that sometimes enemy fighters lose their nerve by just looking at them. Flayed Ones also frequently act in a manner similar to scouts, sneaking ahead of the main Necron force or even burying themselves in the ground, and use either method to gain the element of surprise during a battle.
Wraith: Wraiths are one of the more sophisticated Necron units. They lack legs or a body (except for the spinal cord) and hover over the battlefield, moving at supernatural speeds. They are fearsome close combat warriors, and they can phase in and out during their flight, becoming ghostly figures (thus the name wraith). This phase shift ability allows them to move through solid objects or even to avoid damage.
Destroyer: Destroyers are Immortals fused to fast and agile hovercraft platforms. Equipped with Gauss Cannons and sophisticated targeting systems which enable them to fire while moving, Destroyers are ideal for hit-and-run attacks or disrupting enemy flanks. They also come in a Heavy Destroyer variant, which is armed with the more powerful Heavy Gauss Cannon, useful for destroying foes with the heaviest armor.
Scarabs: Countless small, beetle-like robots called Scarabs often appear on the battlefield; these clouds of Scarabs are termed Scarab Swarms by their opponents. These swarms rely on sheer numbers to make themselves difficult to destroy, and are useful for disrupting enemies who are caught unaware.
Tomb Spyder: Large, spider-like robots which are normally tasked with maintaining the Necron tomb complexes. They sometimes appear on the battlefield, where they make resilient fighters who have limited ability to augment the healing factor of the 'living metal' on nearby Necrons. They also can use their internal systems to manufacture Scarabs in the midst of a battle.

The Monolith fires its Flux Arc Projectors while teleporting a group of Warriors.Monolith: Shaped like a huge black pyramid with a large green crystal at the top, the Monolith frequently enters the battle by teleporting directly onto the battle. It then slowly hovers over the battlefield, its numerous weapons causing mayhem while the 'living metal' armor plating easily fends off counter-attacks; this metal can rapidly heal even the most massive damage caused by anti-tank weapons, making a Monolith incredibly difficult to disable or destroy. The Monolith also displays the ability to teleport other Necrons- both those already on the battlefield and those reinforcements who have not yet arrived.
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Necron Fleets
While Necron forces are usually land-based, Necron space vessels are not unheard of, though are quite possibly much more common than people realise, and simply not seen. This is supported by the Necrons' terrifying ability to appear almost anywhere. There are more than two dozen records of Necron contacts in space in Imperial archives, and accounts of other races battling Necron fleets also exist.

Necron technology is beyond anything the galaxy has ever seen, surpassing even that of the highly advanced Eldar. Their ships are stunningly fast and agile, equipped with propulsion systems which are capable of traveling interstellar distances without entering the Warp. This is achieved, as far as is known, by somehow making their ships unbound by inertia, allowing them to accelerate almost instantly and infinitely, which explains why Necron ships are often seen to be visibly decelerating upon reaching the site of battle. This also protects them from many of the practical problems and dangers of warp travel. All Necron ships are well-armored, equipped with self-repair systems and utilize some sort of advanced stealth technology which makes them difficult to detect for enemy targeting systems, granting Necron vessels surprising staying power overall. Although still devastating, Necron naval weaponry does not seem to match the raw power of some Imperial designs, they are however known to by-pass many conventional defense systems and strike with an unearthly accuracy.

In every battle so far the Necrons could only be defeated by superior numbers, and engaging Necrons on even terms proved to be suicide. Fortunately, all of the Necron fleets encountered so far were small task forces and usually disengaged and phased out like their land-based counterparts, rather than putting up a full fight. But their frequency seems to be increasing, and the possibility of a massive Necron attack is dreaded by the Imperium as well as other sentient races. Even as a raiding force, they are a serious threat, as they are fully capable of outmanoeuvring most other fleets (probably with the exception of Eldar and their dark kin) to pick fights on an even footing. This often leads to catastrophic losses for enemy fleets and forces them to somehow stall with an utterly inferior fighting force for overwhelming reinforcements to arrive, at which point the Necrons simply disengage.

Known Necron space vessels are:


Cairn class TombshipCairn class Tombship: Largest Necron ship encountered so far, the Tombship is a terrifyingly well-armed craft easily capable of defeating any Imperial battleship. Equipped with various heavy weapon batteries for both long and short range attack, Tombships can wreak havoc while absorbing a disheartening amount of return fire. They are also known to sometimes carry special vaults called Sepulchres. These mysterious devices wear down the minds of enemy crews, causing unrest throughout the ship and disrupting the chain of command. Also, Sepulchre-equipped Tombships seem to be able to shoot down incoming ordnance much more easily than their normal counterparts.
Fortunately for all races, Tombships have so far only been met on seven occasions, always serving as flagships. While thought to be the largest vessel serving the Necrons, some Orks talk about another class of Necron battleship larger yet, dwarfing one of their mighty space hulks. Knowing Orkish behaviour, however, it would not be surprising if this was simply the ramblings of fleeing greenskins attempting to salvage some shred of 'dignity'. However the potency of Necron miltary might in the past combined with the short time they have made their presence know means that this should not be dismissed

Scythe class Harvest Ship: Designated as cruisers of Necron fleets, Harvest Ships are a common sight in any Necron force. Their sleek lines make them appear lightly built, but this is highly deceptive as many pilots found out the hard way. Harvest Ships are incredibly resilient for their size and have an impressive amount of firepower, carrying weapon systems similar to that of a Cairn Tombship. With speed, resilience and firepower, the Harvest Ship is a match for any but the largest Imperial craft.
Shroud class Light Cruiser: More of an infiltration and recon vessel than a warship, Shroud Light Cruisers are still formidable foes. However, their most striking feature is their hyper-advanced stealth and sensor systems. Shrouds can pass through minefields undetected while scanning enemy formations and relaying information to the rest of the Necron fleet, giving the Necron commanders an important advantage. The five Necron vessels that infiltrated the Adeptus Mechanicus homeworld in the Mars Incident were all Shroud light cruisers.
Jackal class Raider: Necron Raiders are designated to be the equivalents of Imperial escort ships and are a common sight in any Necron fleet like their Imperial counterparts. Small and very agile vessels, Raiders are usually utilized as fighter support for larger Necron ships. Jackal is the slightly larger variant of the two known Raider classes.
Dirge class Raider: The Dirge class is the smaller variant of Necron Raiders. While lacking the firepower of Jackals, they are one of the fastest vessels in the battlefield, capable of outstripping almost any other ship in existence in a straight line.

Hey Poodle Dude, WTF is all that about?

And GGCAS, what's your general strategy for fighting Genestealer hordes?

Hey, what is this I hear about a C'Tan called the Void Dragon and that it is possibly in a slumber on mars as the most powerful of all the C'tan?

I mean, the Adeptus Mechanicus hail from mars.. and they pray to the machine God more than they do the Emperor... and well, I have heard that they could actually be worshipping the Void Dragon as their machine God.

Eh?

Mm, I do know that the C'tan are "star gods" whom feed on stars.
That would surely make for a climactic event amidst the imperium... wow I am just having the crazy mental picture of an event of that magnitude.

Here it is for you in words.
C'Tan Wakes Up
C'Tan Destroys Mars
C'Tan Eats Sun
Imperium Is Destroyed
Emperor Is Reborn Without Marines
Emperor Is Picked Off By One Of Many Enemies
THE END!

Or, the Emporer begins a new rien on one of the many planets, and the Imperium stands.

I'm not so sure that the Dragon would smash Mars to tiny pieces. If we look in the Necron Codex it mentions a story about the Deciever popping up at various times to instruct a civilization on what they should do, and those people worshipped it as a god. The Adeptus Mechanicus worships the Dragon as a god, and just so happen to have their home base on the same planet where he's sleeping. It could very well be the same thing, and when the Dragon rises he may turn the Adeptus into a new form of Necron. After all, they do seem to value metal over flesh and deem people with more artificial parts to be more holy than those with none.

Also, I'm pretty sure that the C'Tan have gotten bored of eating suns. The Dragon would likely smash it to create an AEonic Orb instead.