There were many options for framing the structure including wood, a PVC hoop, metal hoop, and more. In the end, I opted for a 1/2″ galvanised pipe structure which could be tied into the lower walls. It obstructs the least light, is much stronger than pvc, and readily repairable.
It took a few days to construct and attach securely to the walls. The old building was not square, nor were the sides the same height, so it took some creative configuration to get it done!
It turned out higher than needed, but that will just encourage some vertical growing !
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