I was playing around with a drawing program, not being very precise/accurate, using dimensions from the 5U dissipante at diyaudio/modushop and the only way I could get the ten boards to fit inside at all was to mount them vertically with the caps oriented front-to-back. Then of course you also have to fit three transformers in there. I haven't ordered them yet so I have little idea how big they are. I didn't check for clearance but I imagine that jacks and power input might have to go in the middle because the boards fill most of the space along the sides.