Polycount have released more Unreal Tournament 2003 source art! which offers the 3D Studio MAX animation skeleton files for all the character groups.

UT2003 Skeletons - Alien [30 megs]
UT2003 Skeletons - Bot [26 megs]
UT2003 Skeletons - Human Female [34 megs]
UT2003 Skeletons - Human Male [31 megs]
UT2003 Skeletons - Juggernaut [24 megs]
UT2003 Skeletons - All Species [143 megs, all the other zips in one download]

UT2003 skeletons are out of the closet