Hey sting, have you thought about just making the bunk bed parts? the swing assembly on the back wall is made from 2 pieces of 1" angle on each side, then you need 2 strips of 1 1/2 inch x 1/4 inch metal bar, you can use gate latch parts for the locking/latching front pieces, and then you can make the bed frame to what ever size you want, cause i know you have 5' in your back storage area, I'm sure we could come up with the exact measurements of the cable lengths and placements of all the bolt holes and parts lengths, It might be a pita , but just in case you didn't get the pieces from a nother forum member, it might be a fun alternative.