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They will soar on wings like eagles, they will run and not grow weary, they will walk and not be faint. Stainless steel bolts with stainless washers and lock washers, sealed with a good marine water proof adhesive should do the job, better than factory.

When I did mine like yours, I used two pieces of plywood and painted with oil base paint, two coats.
My biggest question is what fasteners should I use to replace these aluminum rivets, that won't leak or rust?
It peeled after a couple of years so I should have used some resin either epoxy or polyester.
That's what I would do, use some polyester resin and paint the plywood all over, especially the edges with the resin and let it cure good before assembly.

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