UT2003 models

Well, as far as i know, its not been reverse engineered yet. My only guess is that you''ll have to do it yourself..

If you own the game, you will notice that all the tools are included to create mods and models for it, including Maya Personal Learning Edition, so I would assume that UT either Uses Maya models directly, or theres an exporter included to convert Maya models to UT format...take a look.