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My knowledge of siege weaponry and history, might help at this point. Yet i am unsure what era the weaponry should be, scientific or brutal?

Scientific: Devastating, efficient, minimal collateral damage (Rubble and what not)

Brutal: Total devastation, no survivors, F*** your s*** bro kind of warfare.

I also had an idea for the Earth bender elite guard. Their metal gauntlets and boots could be treated so that they have a fire resistance. The metal used could also have been blued to prevent rust from water bender attacks. So this way they will be great fighters with only a few weaknesses.

Airbender tech:
Imagine a pair of gauntlets, with holes all along the surface. The gauntlets would be lightweight, and leave a few inches in between the user's own skin and the device. It is kept in place with a simple leather strap, and overall, as a sleek design.
The function of the gauntlets is to pass high speed air through the multiple holes, and then use the hole located in the palm in order to fire this high speed air much faster than the airbender's natural ability would allow.

@Shadow: just a quick question... how is it that the solar panels transfer the sun's energy to the bender/user of the suit. Also I believe that one draw back would be that if a firebender were to shoot lightning at the suit and if it were to make contact would it not overload the solar panels creating a short circuit and frying the user? I suggest you have the user wear a suit to protect from shocks. Aswell as oxygen tanks built into the suit, you know incase of waterbenders and their water bending and what not.

Forgive me if I completely screwed up this post. I'm using my phone and I'm at an airport... all the colors and sizes are probably wrong. Woops.

I don't even have time to express how awesome this all is, which is killing me. Gah!

PleasekeepgoingI'lldieifyoudon't.

This may seem slightly late for things, but please try to remember to approach every concept seriously, or positively, and that, as per the above statement, people are genuinely considering your ideas.

Or they'll have to deal with Mama Alannaa.

We actually haven't had too serious of issues, really, which is brilliant. Please keep doing that. Whatever it is. Just don't stop. We of the crew and GVCs and Opti himself are actually sitting here watching intently. We like watching you publicly discuss and refine concepts and willingly jumping to answer questions from us and each other. This is very much an interactive group project. We will act like the heavy machinery-cranes, forklifts, and the occasional saw or blowtorch, as we set the skeleton of this guild up. We work as the order, but you guys are ultimately the eye that feeds the creation. You are, in essence, our contractors. We'll do our best to set the foundation and ribs, but we could really use your help to plaster and paint the walls.

Besides, some of you have better ideas than uswe like you.

So just do us the exquisite favor of being mindful of the fact that we're all people with a common interest and common origins(a womb) and we all are relatively decent people who may have relatively decent to awesome ideas.

Now, off my rant, as it were, I'm going to go finish some profiles and reviewing others, and then come back and have my little scientist-y moment with ya'll.

I have something very similar that Optimist said was a-okey, for my character specifically, based on his promised ranked as Highest in Command of the United Military whosiwhatzit.
As a sidenote, I'm making sorta-detailed blueprints of the weapon.
The general idea, instead of going with stealth, is how a form of metal-bending exclusive gun works. It's similar in composition to a rail gun, with two straight rods jutting from my character's transport vehicle. With my character standing directly above this, with a sort of raised footing on or beside the rods themselves, he would use these rods to fire off metal disks. These disks are loaded directly on to the rods by another part of the overall weapon, but that is a small detail.
The shot disks would have a spin as a result of the two rods, which increases their range and overall concussive force.