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Without giving you drawings and such, here's a shopping list. A sharp saw or hacksaw for cutting PVC pipe, several lengths of 1-1/4" PVC pipe, one length of 1-1/2" PVC pipe, two 1-1/2" PVC pipe caps, several 1-1/4" elbows, two 5 gal buckets and a couple bags of quickcrete. Mix up the quick crete, one bag in each of the two buckets, set two short lengths of 1-1/2" pvc pipe upright in the center of each bucket. You might want to cap them to keep the concrete out of the pipe. When they set hard you have the supports for your system that are transportable, but WON'T fall over without considerable effort. use the 1-1/4" pipe and elbows to erect your uprights and crossbeam, to whatever length you wish. The 1 1/4" pipe will slide snugly inside the 1 1/2" pipe. If color is important. buy a can of black spray paint.
Everything on the list above will cost you under 60 bucks at your local home depot, and is more adaptable, adjustable, durable than any of the crappy tube steel setups I've gotten off ebay, and completely replaceable for another 60 bucks. This frame, of course, will work fine with either cloth or paper. Good luck.
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never even thought to MAKE one... and im a duct tape and super glue kind of guy.
but 1/4" pvc 9 feet in length as a crossbeam will tottaly bow... the weight will be distributed and pulling mainly on the ends near the stands so i guess it would be fine. despite portability this sounds like the way to go, i might have to improvise this idea to make it more portable, thanks!