Haven't been around in a bit gents... 5/8" plywood for the fold down beds. No padding only carpeted on both sides. We use various inflatable mattresses for our needs.
The bed hinges are piano hinges which I have seen up to 96" in length.
As some pictures show, I can drop one side singly for solo camping (deluxe!) or drop both sides for the love shack.
Really, I drew up the design, and Van Specialties in Portland Or. built the interior.
Detail work is a result of a sharp builder. Van Specialties has some guru's there.
If you question your skills, and live on the west coast, you owe yourself to at least chat with Van Specialites.
Can I plug them any more???