Don,
I used the original metal for my PA and it does not wrap back up the inside.
I think you are right that wrapping up the inside would form a water trap. I
did seal the edges with urethane sealer, 3M 5200 FC as used in boats, some
silicone (old types) are acidic. Before assembling the wood frame I sealed
it with polyurethane varnish. I also used metal threaded inserts ("Rosans")
or "T" nuts wherever possible to strengthen the joints.
Good luck,
Jack
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