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I made one of these back in 2005, the only differences are that mine had 1x4 boards all the way around the bottom standing on edge and I framed one end in wood cut to fit a door I hung. mine was pretty large 2@ 20x30 tarps overlapping the long middle rib. I used 3' rebar and 1" sch 40 pvc. one could park 2 cars tightly side by side and still have a 18'x 15' living space, I put pallets down covered in cardboard to keep little crawly things at bay= worked great. called mine a Quonset no wind, water or critters got inside mine.