The bunk beds proved to be the most difficult, and most often redesigned part of our conversion. Luckily we had plenty of help.
The initial plan was a solid headboard and footboard scribed to the wall and the ceiling. We spent at least six hours, two calendar weeks, and countless pieces of cardboard before we managed to get a decent template for the first headboard. Then we slid the prototype down to the footboard location. Time to go back to the drawing board! Neither wall is straight, and each of the four boards would need to be significantly different in order to fit their location. In the end, we decided to make avoiding the wall and the ceiling a design feature in an attempt to save my remaining sanity.
Once we had a plan, I was able to build the beds at home during the week. When we where happy, we had a very nice kit ready to take back to the farm and assemble.
We used aluminum c-channel screwed to the floor to layout the anchor the bunks. The rail for the top bunk is screwed securely to the steel ribs between the windows. There were a few custom curves where the wire chase runs near the top of the bunk, but these could be trimmed a little at a time with a jigsaw. Need a little off? Take a little off and see how it fits.
Notice how none of the boards actually follow the profile of the bus? No? Neither does anybody else!