those are good qualifications to add. i have made these short (~24" tall) to lessen "wobble". i wouldn't put a larger tank on this kind of stand except with substantially thicker pipe.
i probably acquired the same poor-quality flanges that you describe. i had to try different combinations of pre-threaded pipe and flange, and exchange a couple of flanges at the store, but i eventually got the legs to mount square.
the whole thing looks pretty nice all set up.
the only out-of-tank equipment associated with this system was a powerstrip and timer. i hung these on the wall with a tidy, finished piece of plywood.
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Hydrophyte
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