I used wood because it was so simple to use and work with. Easy to cut, secure, attach, the edges (PVC is round) help me keep it in place. I also could attach and make weird angles and connections, while PVC is fairly limited (for me) in how it can be assembled.
You might not need a frame, you may have the skill to do without it, but I couldn't imagine how my boat tail would go without it.
I like your hinge idea.
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