I'm just waiting for people to figure out how to add armor pieces. Shouldn't be too hard since there's the Dr Pepper helmets that will add N7 armor parts. So they wouldn't be working totally blind there, but I understand that reverse engineering that stuff isn't an overnight thing.
Anyway, custom armor will be awesome. There's already custom hair and normandy civvies, but the hair is done with editing savegames and I'm not sure how he got the casual attire hacked in.