I did a board like that once. It was about as planar as the average potato chip. I could put it flat on my desk and give it a twirl and it would spin for almost a minute.
There has to be a solution. Rogers sells a lot of pcb material.
use a pipe union for the last junction, after which it won't sit well on a level surface. (wrong question)
Put elbows on the ends with pipe stubs that go half way, and fit channel or angle around the stubs and fix with screws.
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