I've been trying to figure this out myself and was able to get the model inside the game but with no textures and a head that spins around in-game when I tried playing with it (assuming that is a super model issue?) - I know nothing about modding but thought it'd be fun to use his head with some edits of my own. Would anyone else able to do it for me or show me what I need to do? This post in this thread helped me figure out what to do for the most part but I have hit a road block.
Thank you so much to anyone willing to help out this longtime KOTOR player!