Re: software for simple line drawing
I really don't have any suggestions, except that if you put separate body parts on different layers it would be easier to stretch or rotate. I personally like ArtRage, but photoshop, and anything that gives you selections should work. There is also the mesh layers in photoshop, but that too is very complicated.
If you could scan in the drawings and then make them into vectors, that would work, but again, I think I'm suggesting more complicated solutions.
Sorry I can be more help.