Use one of those "T" splitters for 2/3rds down the middle of each vertical post. Then there won't be any glue necessary.
Then an elbow "L" at the top of each vertical post, and slightly sand down the edges of each side of the bar that goes accross (horizontally ).
Place it in the "L" splitter and it will be loose enough to spin.
Then put a strip of edhesive velcro accross the top horizontal bar, and on any sheet you wish to use. This way it won't slide off.
Finally, the whole thing will be able to roll-up/down the sheet and be dismantled neatly.
I would also suggest using an "L" joint for the base, with extra pvc pipes attached. It will allow the rig to stand without any clamps etc.
Please forgive the 3rd grade cellphone image l took of my screen.
I did this in like 60 seconds because l know some people are visual.
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