I agree-I thought that perhaps if we could use a jumpsuit as a base and work from there, but the armor in the game is very clean...and jumpsuits tend to be baggy.
I'm still not sure on what Assault Rifle. However the helmet looks to be a normal costuming job. Also I'm interested in making minatures of the game characters (12 inches, "G.I. Joe" size)
But the weapons will be fun.