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Many thanks, Rich, for this interesting news. It seems the photos I posted confirmed that my flooring method was similar -- or even identical -- to yours.
The one item that made me think it might not be factory-installed was that the plywood sheathing appears to be fir based and not mahogany. Was your sheathing fir or mahogany?
Also, confirming that the 5/4 x 5/4 fastening strips on my boat are mahogany, although they appear to be only one inch square or less. Possibly shrunk over the years. I have access to mahogany for this purpose.
Also, on your SS, was the floor sheathing 3/4" or 1/2"?
You may be absolutely right about the changeover in factory construction methods between about '65 and '68. It is obvious that this flooring arrangement in my 1968 Corsair 20' Sea V is (was) extremely robust and ridgid, with all sorts of effort taken to avoid flexing, shearing, vibrating or movement of any kind. It is admirable in its strength and complexity and damnable in its resistance to demolition!