MELGAR,
You are too kind :-). Thank-you for the excellent photographs. This kit has been totally redesigned! Yours is reminiscent of actual 2x4 construction. The manufacturers have greatly simplified construction.
At this very moment, I'm laying out all the parts and can better see how the floor might work. But, it certainly looks like it will need to sit upon some little bits of scrap wood to ensure it stays in place. I will try to photograph as I go along.
Thanks again for the very clear and informative photos.
Tomlinson Run Railroad