Many big replies to many small questions
-1. What's the problem you're having with the UV mapping? Would it help if someone else UV mapped the helmets and sent you the files after?
0. Good work (I haven't downloaded and tested yet, but looks fine so far)
1. It's the same for "davin type peasant" and "shi" models as well. We do have body models for these, but none of them are rigged at the moment. We do want all clothing types for all bodytypes though - so build them against one model, then they'll be resized for others later (so peasant body type could be wearing leather armour just as easily as hero body type could be wearing a doctor's coat. As only the hero type is implemented and animated, it makes sense to make them fit this first.
2. It technically does on models, but they don't respond well with shadow and outlines. For the textures, we don't know how to do this yet, but it'd be great if we could (I can think of many uses of being able to overlay partial textures in future). Make the receding hair as a separate hair model. You can probably just "extract" a few of the faces from the head, then extrude them down into a more solid shape. Should kind of work. Alternately, I did some test hair models recently - I could send you these, and you can just edit/alter/delete the bits until it leaves the correct hair line.
3. It does this on quite a few of the existing models. They probably all need tweaking slightly. Don't worry too much about this for now, we can make adjustments later.
4. Excellent
5. I'll have a closer look at the model soonish and see if I can give you some more detailed feedback.
Probably find a nice compromise for beards etc - making them slightly bigger, so they at least show up as a few pixels in game, but not stupidly big
There's a "disablelayer" and "disablesubset" thing we can put on a model in the fo3d, so we can say "hair disappears when wearing this hat" or "subset disappears when wearing this coat" etc. Probably something I should write up in more detail at some point.
One of the problems is that you'll get this "hat baldness" you may have seen in other games. Mohawk hair sticks upwards, so needs removing when wearing a hat, unfortunately if you set the hat to "disablelayer 7", it would remove the hair regardless of style - so a long haired character would also be "magically bald". The only thing I can think to solve this initially is to break hair into multiple subsets somehow, so you'd have multiple areas of hair which could be separately disabled i.e. power armour helmet removes all subsets of hair, baseball cap only removes "sticks upwards" subset, allowing "downwards" hair to remain etc. I think it's possible, but don't know how yet.
Yes to female versions for all. If there's not an existing model, you've got a bit of creative freedom regarding the exact shape etc.