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This is a Space 1999 Moon Buggy scaled to the new 22" model kits. This is the wheels and seats, attached to a sprue for cheaper printing, and is intended to go with the body model I also have available.
NOTE: This is an updated version, uploaded on Jan 27, 2016. The tires are a bit more rounded at the circumpherence, and the treads a bit larger, after studying images of actual Amphicats.