Mike Graham (mentioned above), and CoasterGod are two great modelers. I recently came across Chris' site (modelrollercoasters.com). He has done an outstanding job, and has made the cleanest-looking, most precise coasters I have seen. To know that they actually operate is unbelievable.
I have done several models, including working carnival rides in different scales (do you have any idea how HARD it is to scratchbuild a working N scale scrambler?? That's half the size of H.O.!). I am now working on larger scale (1 inch = 2 feet) operating loopers, mostly of Arrow Dynamics style. I also just completed the FALLER working coaster and the huge KNEX toy coaster from Toys R' Us!! It is worth the $$$!
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www.angelfire.com/oh4/tk173 First rule of Stormtroopers: Pee BEFORE you put on the uniform!