OK, a quick update.
I've been reading everything posted here, and the threads I catch on the 4c. It's impressive the stuff you guys are contributing, keep it up! I consider everything, no matter how small.
Here are some ideas that really stood out to me:
Providing 'official' papercraft of some kind in the codexes. That to me is a great idea, I wish I knew who suggested it. It will give players some idea of what we see in their heads, an option to use for games, but still completely optional for them to use. That level of user-friendly open endedness is great!
Dice Mechanics: D6. Everyone has them, so everyone can use them. No fancy D10s or what not, so I'll try to keep everything D6 based.
Construction Guide: I like this, the option to let users customize a force is great. I don't think it will be too difficult, and I can't prevent abuse with a simple paragraph in the main book, something along the lines of "If you want to use it in a game, by all means field a custom force, providing your opponent agrees" With luck, it will self regulate, like battletech, to prevent abuse.