The bunkbeds are a little hard to get a picture of but I tried. I used the Gaucho that was already installed for the lower bunk and supported the upper bunk so it doesn't hang off the walls. The supports along the outside wall are 5/16" plywood laminated in 2 pieces to make it 5/8" thick. The 5/16" ply will bend to conform to the curved walls so I cut the pieces and dry fitted them and then spread glue between the two pieces and screwed them to the wall to take shape. If you unscrew them you get a nice curved support piece, there are 4 of them and they land on the Aluminium frame of the gaucho below. The front is supported by two pieces of 5/8" plywood that go all the way to the floor. I got a great deal on some sheets of 5/8" ply so you will see it in most of my projects :-)
Had to notch the bed frame a little so we can still open the window. The frame is made with, you guessed it, 5/8" plywood and is sheeted with some 3/16" wall panelling. The frame is glued and screwed together and then installed onto the support strips. It's also screwed to the wall to keep everything stable. There are some pictures below, I can put measurements up when I get home tonight if anyone wants them. It's a bit of a tight squeeze on the top bunk, I would lower it a bit next time but my daughter doesn't seem to mind sleeping up there.
Oh yeah, I took the oven out to make space and used the old piece as a template to make a solid wall between the kitchen and the beds. The wall is just a thin piece of wall panelling in the original frame. One of the things I love about the AS is that everything is modular and can be taken apart without destroying it. I managed to sell the oven and front gaucho so some other Airstreamer can enjoy them!
Bed frame before installation or staining.