Second try to get the floor boards cut and fitted properly.
I used 1/4 birch G1s plywood for for the floor boards. Sides are 1/8” birch. Pictures are before staining and clear coating.
I will be doing fabric on the interior of the cabin (ahead of the baggage compartment). Still pondering if the sides should be hidden behind the fabric or installed after fabric to provide some protection. I'm leaning towards having them exposed to protect the fabric.