Here's what they look like after pressing against wet foam for 30 yrs.
Coating it is a good idea. Then some maybe glassed wood "feet" to hold it off the bottom, and minimal foam around the sides/over the top edge, to hold it firmly in place is what I'm thinking.
I'm debating two options for drainage. Either nix the pvc and allow a gap under the bulkheads for water to flow to the back. Or glass one or two PVC pipes in and seal the fuel compartment completely.
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