Actually the deck finish needs a bit of work but otherwise it's good, thanks. This is where I bought `bakelite sheet' recently. I'm very happy with the quality https://www.swiftsupplies.com.au/fabric-bakelite-sheet
I see you do have a biggish hole to fill. I suggest keeping the plate underneath as more of a cosmetic cover plate, loose fitting, so it can't hold moisture. Above, I'd be doing what you're doing but I'd prefer to use the more rubbery goop. But butyl will work. Just might get a bit messy with so much in there!
Rick
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