I did a Trek mod a long time ago. It was just a race replacment, did not modify compnents or techs to a Star Trek universe. Planned on it, but never got around to it.
Didn't strictly follow the Star Fleet Battles races. I just used a variety of races from TOS, TNG, DS9, VOY. Some of the shipsets were redone, in other case I just used exsisting SEIV shipsets and replaced the race pics. Did that for the Tholians. Used the Piundon shipset. Could not find any decent Tholian ship pics to use for a set.
Anyway, you can get it here if you are interested...
Trek Mod Version 2.0 (Includes Voyager Scenario)
If you don't have Gold, you can get the pre-gold Version on PBW in the mod library.
Geoschmo