Dave I believe the floor will work out to 76" wide total width ... which would give me a true 6' inside , mounting the foam on top the floor (as above ^) ... That floor sandwich does sound like the best idea ... I'll have to rip the framing strips the exact width of the foam , just so it can be glued together solid ... should be strong ... all the edges double wrapped with the fabric , should prevent most rot problems ... Now I'm wondering if 1/4- 3/8" ply would work for the floor ply ... the foam and framing should be strong enough , eh ? the shell should be pretty light ... Figuring 12 sheets of foam (120lbs. ) some wooden ribs .. (? say 50 libs) canvas , glue , paint some screws and bolts ... probably the whole shell (less the floor ) maybe 250lbs. with a few windows ... Still pretty LIGHT ..
Still haunted by the thoughts of a dropped floor cooler ??? May be impractical for my layout ..

That and I just bought a coleman 5 day ice chest .. The mid size with the wheels and handle ... that should be "convenient" ... fit right under the Mini galley .. I'm SURE the wife wouldn't mind a "wine cellar "
Today we'll take some 24" X 48" x 1/4" green foam boards , tape them together and fab an end plate (cross section to better refine the measurements ... then use that as a template to layout the rib bending ... Thinking of doing it Indian style , just stakes driven into the ground at the proper location and the wood strips bent over those ... still looking for a source of Hickory , because a 1/4" strip bent in the 3' radius shown would be darn near impossible to break ... It will take a "set" but won't break ... We've built many longbows out of Hickory , never broke one , even when overdrawn by an excessive margin ... Should make excellent and STRONG framing ... the foam will really just support the canvas ...
All very much like that Conestoga Wagon with a foam/fabric skin instead of a canvas... nothing new here , all well proven ...
Thinking the inside will look like the inside of a victorian dirigible ...
