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I believe the lumber on our 1981 Sport 13 is original. Plywood was not used anywhere. There is a reason for that, IMO. Plywood is not as good as solid wood for exterior use in a marine environment. Plywood used out doors will delaminate at some point in it's life even when protected by solid edging. Glue will eventually fail. Even the best Dutch marine plywood will eventually fail to hold up. Solid mahogany costs much more but if your budget can stand it you should consider it.