Everything is made for either 1/2" or 3/4" plywood. I'm afraid if I used aluminum, nothing would line up.
Today I finished gutting the interior. Any aluminum panel that was on top of plywood and not riveted to the hull was removed. All the old plywood is gone. I was surprised at how wet it was under the floor. I lowered the nose so the water would run to the front and vacuumed a couple gallons, and more was seeping from under the foam. I plan on leaving it open for at least a week to let things dry out. I was able to run a 1 1/2" pvc from front to back as a wire chase. When the new fuel line/primer bulb gets here, I'll drop it in the water and check the live well hoses for leaks before the new floor goes in.