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What wall tubing are you thinking? I would not go more than 3/16 wall. 1/8 would be fine. I would also consider adding a cross brace that bisects the 48". Top only. It looks like you plan on angle for the bottom ring. Nice idea! Is the plan to made a waterproof ring around the base?
The plywood or a plastic top would be nice. When I set up my 180, I put a 1/2 foam sheet under it. This would help with any out of square issues you might have with the floor or stand.
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