The poly count on those wheels is WAYYYY too high. cut back a bit; not every detail has to be there, especially if it drops your FPS by 10 when you look at them.
Also, I assume the floating rocks in the last picture will be connected to something?
^either that, or those are supposed to be the floating mountains from the film, which is a very cool idea, but that would make this a fantasy coaster...
^Yeah, I thought about that right after I posted. That would be a cool idea, but if he goes that route, the supports at the top of the lift should be the floating ones, not the ones on some random hill halfway through the ride. Just saying...