I found an image of bunkbeds on allprowest.com I'm planning on doing it on my CT conversion.
Basically it consists of 4 metal brackets attached to one wall, one pair for each bed. The front consist of 2 metal bars on each corner opposite the wall and connected to each bed. The brackets and metal bars allow the beds to swing up flash with the wall, mattresses attached and stapped to a couple of brackets to keep it in place. The brackets will need some fabrication unless someone already makes one out there. As soon as I can figure this system out I will load it.
Try the following link, No guarantees it will work:
http://www.allprowest.com/images/photo110_1_.jpg