Here is a 1/8 scale off-road track I'm building in my backyard. There are two tracks here. A high speed flat track with burms and a 1/3 mile long off-road track with hazards; mounds, jumps, rough terrain, 4 mud pits. The mud pits are piped to fill with water with a simple valve all at once. Took 3 days to build, some fine adjustments is still needed.
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