I've started this ride a week ago.
It's based off of Silver Comet at Martin's Fantasy Island.
http://www.rcdb.com/id548.htm
I have finished the layout and I'm currently going through the track working out the small jerks and pumps to make it smooth.
I'll be adding 3Ds using Google SketchUp, so if anyone can export my files as 3Ds, it'll be much appreciated!
Some screens:
http://www.nolimitsdevcenter.net/p3631