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Some of these build techniques may help what you're after. This guy uses the bottom lip as a clamp while he builds.
You may have better luck and might find it cheaper to use 1 pvc sheet for the bottom than using epoxy coated pvc. You can always add plywood as an underlayment depending on how you have your stand. I would use a strong solvent like Weldon 711 vs the Oatey stuff to chemically bond the two pvc panels together for the bottom. I'd look into something like Dow 795 to seal it.
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