Thanks for the tips all!
Actually the dragontail was the reason I started looking into the single wall design. Prior to that I thought single wall was a nice way of saying, "too cheap to buy a decent tent" When I saw the dragontail it reminded me of a design I saw on my trip to AK in '03. A couple with a heavy german accent (I think) had a Tatonka tent and it was very interesting to me. I really like the fact that the Fling can be self supportive.
Bmisf, Are the floors "attached" on the rainbow? I can't tell from the website's photos if screen connects the flooring to the walls.

Thanks again all!
Little Otter