Draculaz has a couple on his web site..either Rendergods, or Digital Freewriters canada..they're Wings creations, but I think they are available in .3ds..
Star Trek Australia has the big'ns from the show and movies, and 3d Gladiators (or whatever they're calling themselves nowadays..I think one's called 'selfish', and the other is Warriors..?;) had the K7 station.
theForce.net should have any space stations that were in Star Wars (though I've been told they have Star Trek stuff too..;). Strafe, above, is a good place for 2001 models. There's a TV and movie mesh site out there..that might have some stuff
Check the 3d links here, I have a posting that has all the above URL's, it's under my name (it's getting a bit long in the tooth, so I wouldn't wait too long)..I did the above from memory, so check it out.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)