yes! pc mods for kotor do work on the xbox. all you need to do is put an Override folder in the xbox's harddrive.
for those of you that are new to this;
you'll need a modded xbox (mod chip installed) with an ftp connection to and from your computer to pull this off. the best program i use is flashfxp to log into the xbox and explore it's harddrive from my laptop "windows XP, blah blah blah"
lots of learning will be needed.
for those of you that allready know all this, and have flashfxp;
this is the xbox address to where you stick the Override folder; /E/TDATA/4c410003/ <-----add Override folder
so it looks like this /E/TDATA/4c410003/Override/ <--- all modded .2da, .utc, .tga, .wav, and other kotor files go here
remember, you cannot make a game save out of all modded content.
creature skins, sounds, new items such, for example--> Black Hilted sabers will not show up on another"non-modded" xbox trying to load that game save..
hope that helps