Do you have any pictures and/or drawings of this, Richard? It sounds very much like the sort of thing I want - except I would probably need to have it 6' wide so that I could sleep diagonally, as I am 6'5"!
Who fitted it for you? Did you buy it as a fold-up bed, or adapt something?
The only other solution I have come across, since we want a central corridor through the boat, is a 3 section cross bed, with top and bottom fitted and middle folding up by day. Has anyone else tried this and liked or loathed it?
In addition, we want a good sprung mattress to care for our backs.