I know I have asked this question a million times but can someone show me how to install a remapped stormtrooper skin. I have the msh files and tgas, I just need help with the replacing bit.

You have been answered a couple times, too:
http://www.gametoast.com/forums/viewtop ... 27&t=12729

Also, read Jedi creation. There's no difference between adding this or any other unit.