Sorry but there is nobody here who can authorize you to use an asset from any of the Star Wars: Knights of the Old Republic games in another game. LucasArts issued a press release back in 2002 that more or less supported game modifications of LucasArts games. However porting what are essentially copyrighted works from a LucasArts-published game to a non-LucasArts published game probably isn't going to fly, even if it's released free of charge and not-for-profit.
The only contact information I can provide is the general post office box for LucasArts posted on their contact page.
Not sure where to post this (or what address I should mail and etc.) but I am a Owner of both KOTAR games and also the game Fallout New Vegas, I am on the New Vegas Mod forums alot and I saw a few request for Darth Revan's mask/armor, I made the mask but I can't make a (or find a re-made) version of the mask that looks very good, I just need to know who I need to message to (or if any one knows if I legally can) use the texture that's actually FROM the game (witch I have already done, I just can't legally release it without permission) and release it in a non-profit mod for New Vegas.