Floor repair done same as rear areas.
Galvanized sheet metal on top of frame outriggers and rails, 1/8" plywood, 2x framing as needed, 1 1/2" foam between framing, and 1/2" plywood on top.
Lots of quality caulking below and plenty of construction adhesive within.
I used pressure treat lumber wherever I could. You never know when the rot or carpenter ants return.
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