Here's an interesting layout from a caravan. The extra foot wide of a van can enable side to side beds as well as fore and aft. These two benches have been joined by a slatted section that is cunningly hidden in a small drawer and pulled out to fill the gap between the benches. It rests on a ledge in the edge of the benches and the slats are joined together by a flexible tape. The backs of the benches lay down as part of the mattress.
This would work well on a narrow boat, though our preferred option is to use a table with its own foldable legs. When eating or playing games the table would be free-standing between the benches; when sleeping it would rest on the ledge as a base for the bed. Alternatively without it the benches would be two fairly narrow single beds about 2 feet 3 inches wide and 19 inches high (13 inch base and a 6 inch mattress).
The carcases would be made mainly of marine play 20mm thick.
At the moment we have two large white leather rocking chairs but these will soon be redundant.
Anyone care to offer a fair price? Contact Duncan.