I'm back and will be working hard on this for the next week or so.
I've had a few offers of help now, some PM'd some posted here. When I first started out on this I was planning on doing everything myself but now, partly because of the good reception I've had so far and the generous offers of help I've had, I'm thinking that it would be really nice to make this a more open project, I'm not certain how yet. I'll look into the github thing, that may be the best way to go. As far as models go, I'm really keen to keep a consistent feel, but there's a lot to do and help would be nice. My current thinking is that perhaps I will draw out some weapon designs and see if somebody else would like to model them, then I could texture them. It might also be nice, eventually, to get other people making some maps.
As for scripting, I'm not so good but I want to learn. Help in this area could be good. Ultimately I want everything to be built from scratch, right now the models and textures are but the scripts aren't.