You have to decide what's more important, complete accuracy or game-usability! If you recreate a coaster, probably it will end up not working too well in the game (from a lot of recreations I've seen), so you might want to sacrifice some inversions or other elements to make the ride better for playing with.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html