LOL.. too funny.
I've been working on something just like this myself and in fact had to go about it the same way.
For some reason, replacing the defaults bothered me.. but because of the way the head model finds its "default" (neutral to good) texture, you can't point to it in a 2da like you can with the body textures.
Soo.. after some tinkering, hex editing, etc.. I'm now in the process of testing my "new model" which in all honesty is just a reskin with a lot of hacks in the 2das and such in order to get what I wanted.
From looking at your screen shots, I'm betting we even did nearly the same thing.. I wanted a redhead, but didn't like the ones we were given as far as style went. So I swiped one with a hairstyle I liked (think it was A02 - black with the IMO best hairstyle) and reskined it.. then did a bit of minor custom skinning for the body.. renamed everything and added 2da entries all over the place.
Pretty happy with the effects so far.. but was really only doing this as a test and learning experience besides for personal use. Though I could put up some screens and eventually a DL if anyone's interested at all.
Can't wait till we figure out the models though.. that's when I'm really gonna go to town =)
Anyways.. looking good Darth.