I've been doing a lot more work on the animations, TAGs, and other stuff related to the new models, and I wanted an easy way to test the new stuff with my working SVN copy without altering the working copy, so that I could remove or put back in the altered files with the new models quickly and easily.
I also wanted to do this so I could put a single custom pk3 file in the data source, that way other people could also test the new models and animations without making permanent changes to their copy of the game.
I double-checked the folder names internal to the custom pk3 and didn't see anything wrong, but I can't seem to make the game read the extra pk3.
Was this disabled or taken out of the game engine? Or, what am I missing?