Thanks for the link though, I just realised he also mentioned Unreal Gold, which would be awesome to have on OS X, even if it is just Ciderised. As far as UT:GOTY goes, the Cider version I have is working flawlessly.
I'm currently attempting to Cider Unreal and Unreal Gold for OS X.

Hopefully, I can get it working and release them, as well. I was also working on PPC versions, but I'm sure by now, that really doesn't matter too much, unfortunately for the non-OS9 native PPC users.