To Kenny Dykes, ThisSide@aol.com
I'm not sure of all your questions, but we've got a '73, with the port bunk in the main cabin folding out into a "double" bunk. Back around 1980 I replaced the metal legs that came on the fold out section with wood which made fewer holes in the bottom of the cushion.
Also, the Starboard setee back folds up to create an upper and lower bunk situation. If you can stand the "ham", here are pictures of it, the piano hinge, and the leg which holds it up. There is an identical leg at each end.
(Click pics for full size image.)
Finally, I have a head door with a piano hinge.
Rick