I didn't like the idea of having permanent beds sucking up so much precious real estate in the big beauty.
My dad and I were able to engineer a folding bunk bed (2 actually) and it works pretty well.
The nice part is that (in our case) you get 2 decent sized twin beds and when they are folded up take up about only 7 in off the wall. Kind of like a Murphy bed setup but with bunk beds. Very sturdy and subtle. Cant wait to use them!
I built a steel version of bunk beds similar to yours. Mine latch in open or closed position but had to have custom width mattresses made two inches narrower than a twin. Ill try to post a photo or two.