Trying to create something like this
http://www.houzz.com/photos/5170769/Roller-Coaster-Crazy-eclectic--dallas
gatekeeper's suggestion has merit - would suggest getting a surplus coin op ride vehicle and using the fiberglass body shell for the outside (paint it up to match your kid's favorite ride). You can fab up mock bogies using skateboard/scooter wheels and plywood (or if you have access, someone at a machine shop can mill done something for you). You will want to keep things light for safety reasons, so think hollowed out / mock components.
However you attack this, be sure to share lessons and picks!
(ps - I work with a company that makes ride components - so if you get stuck with mocking something up drop me a pm and maybe I can point you in the right direction).
Currently at x0, y0, z0
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