I'm really sorry that I can't help at anything with this mod, but I really hope you guys do it. It was really fun playing the betas back in the day.
Also, are you guys going to support those "Unnoficial Add-ons"? I think it would encourage people not only to play the mod, but expand it. I imagine if people actually modelled more interiors, coded more stuff, it would be even better than what's being planned to be.
Anyway, best of luck for you guys!