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Welcome aboard jase_law. Last yr. there was a fisherman had the same sort of problem, about the car thing, I don't know what he came up with. On building your own flip over, I think you would have to @ least buy the sled part. I don't think you could construct anything light enough. Then you could get your own material to make the poles, then buy some fabric & sew it to fit. I do think it would be a lot more economical to buy. Now if you wanted to build a hardside shanty, that would be more doable. jmo Good luck!