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i think i would make a c out of plywood for the base and then use 2x4s for the supports and then angle the tops so that you could make a bank c on top out of plywood. it would take a lot of time to build but if you put cross supports inbetween the vertical supports it would be pretty solid especially if you got some cheap 1/4 inch plywood for siding.
yea i was kinda hoping they sold C shaped wood but i musta been dreaming