Over the past week I've been working on a terrain GCI. Its more powerful than real GCIs, except retains the quick pacing and twisted (but random) layout of their designs. I still need to smooth a lot of the track, do all of the lateral bracing, create a custom station, place the scenery, and hopefully figure out how to create cartextures that actually fit correctly on the train (this is unlikely).
Here are some screenshots:
http://www.coasters2k.com/forums/album_ ... er_id=8081
If you want to test it, leave your e-mail address. I still have a lot of trackwork to do though.