Use the old decking for use as templates to cut the new decking with.
The new pressure treated plywoods should not be used on an aluminum boat, the treating chemicals are very corrosive to aluminum and steel.
you may want to consider using 3/16 or 1/4" aluminum diamond plate instead of wood/carpet if you ntend to keep the boat. It's the last time you will have to worry about what kind of wood to use or carpet wear, or anything else for that matter..
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