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I built one once as a kid out of some 2x4s, plywood, wagon wheels and some all-thread. Never entered a contest but had lots of fun with it.
Basically, I used the plywood as a deck, 2x4s and all-thread as axles. For steering, the front 2x4 was bolted to the plywood at center and I used a rope tied to each end of the 2x4 (at the wheels) and steered by pulling on one rope or the other kinda like a horse bridle.
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