It is for any era of SWG but the program was originally for Everquest. Uli made some changes so it worked better with SWG but you're still likely to run into a lot of problems.
If you want to get into UI changes I recommend just editing the files yourself. You'll need to learn what does what in those files anyway even if you use try using the builder.
Does anyone have a copy of the pack mentioned in the original post? I'd like to get my hands on that if someone still has it and wouldn't mind sharing.
Does anyone have a copy of the pack mentioned in the original post? I'd like to get my hands on that if someone still has it and wouldn't mind sharing.