Wood in the frame of the shells was eliminated in favor of aluminum several years ago. A really good move on TM's part. But I believe that the perimeter of the floor is framed with wood 2x4's. You can see it on the Plant Tour section of the TrailManor.com website. Since the floor is a single assembly, is well-sealed, has no seams like the roof and side panels, and is never expected to get seriously wet, I think this is a perfectly fine way to build. But if it sits in water, and water does soak inside, all of this works against you. It is really hard to get the water out.
Bill
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