How about a couple pieces of ply-wood? Pad and tape the bottom edges to avoid scuffing. Hinge the upper ends with rope. Cover the whole thing with a tarp or the cover you have now, to seal it.
You could do it in sections too so it isnt such a struggle getting that weight positionned. If it starts to bow in you can add 2X4's for stiffening.
Good luck!
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