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Definitely use HDPE on top, and the metal railing (coping) will help protect the box, and you can use it to do switchups and spins out. And you can also use PVC pipe instead of the metal.
So like trex right? Cause i have a small 4 to 5 foot butter box with trex and it works great but the box it 16ft so its hard a long enough material for it...