Yvon, one of the...
...sailing rags had done this recently. As I recall, there was a hinged board under the single, you could raise it to 90 degrees to make a sea berth or swing it all the way out, put supports up that I think were permanant to make the small double. Seems like it was 'This Ole' Boat, or 'Boat Works', I do not remember. It was about 3 to 5 months ago.For what it's worth.Jack