In a place like this it can sometimes be difficult to figure out where things go, obviously there can be overlap but you want to go make your home in the area that most represents the aspect of your creation you care most about
Let's say you've thought up a thing, say a magical watch that summons weapons.
Obviously it's magical, which would go to BMS, it's a watch, which is an everyday thing, which would go to Life Design, and it summons a weapon, which would go to Green Box; but what actually matters about this watch? It's magic yes, but BMS is more for figuring out how the magic works then saying "it's magic", you would want to go there to work on defining the magical system that it works on. not the watch itself. It's a watch yes, but does that aspect of the item actually mean much of anything in the RP this would play a part in? probably not, say a few things about it and your done, is it shiny, is it plastic, is it huge, is it tiny, digital, leather strap, etc.
The big idea of this watch is that it summons a weapon, really it's the whole point of the item and the niche it was created to fill, somebody needed a thing to summon a weapon. And that weapon might, or might not, be magical, but it's still a weapon so I would take it to Green Box.
That's were you'll find the people who could well argue the case for what it's limitations should be in your context (should you have one), and the people that understand mechanical design to suggest what it should look like for what kind of actions it needs to take (such as the slide action of a pistol).
If say I wanted to make an all-in-one mobile computer interface watch I would go to Life Design for help with what would be aesthetically pleasing, or interactively realistic; you're not going to type on a little watch face, and maybe a holographic interface isn't the image I want to portray.
Say as a different example, an RP or story I'm writing is post apocalyptic +cars, and I want something that started out like an F-150, then got armored up and had some big guns slapped on it; the vehicle might be battle ready but to make it look right I'd be better off going to AutoShop; so I don't end up bolting a machine gun to my hood only to find out the hood has barely any structural support and would crumple on the first shot if not under the gun's weight alone.
So in short, figure out what the main point about your 'thing' is, and go to the area that will help with that; if there's more then one, you're free to go to all of them.
Coalition of Fictional Design
