Joelsprayberry on Instructables writes “This is a DJ CD case turned upside down with 2 layers of hardibacker board (pegboard with no holes). I run an acoustic guitar through all of these pedals to create “live loops” so I needed to have an extremely quiet sound with no low hum or buzz. I ran George L’s audio cables and tons of 9volt power. I think this may be the most amount of pedals you can get into one space.” Link.