Does anyone know of a good sci-fi custom scenery download? I'm making a robot invasion dark ride and was wondering if there was some good objects i could add to the scenes.

This indoor roller coaster, built by MrNozem77, contains a whole slew of sci-fi objects:

http://rctgo.com/downloads/view/13837

You might find some suitable objects in some of the sets in the CS list he has given for the ride.