Situation is: Architect is building his own house. He is wanting to use cinder blocks for some interior walls. Both sides of the CMU will be the finished surface. He wants all his wiring to be inside the walls and all the switches, receptacles, and lights to be flush mounted in the block wall. Does anyone make a box that can be mounted securely in a cinder block. There will be multi gang switches and receptacles in these walls. I am still not clear as to how I am going to wire this. Also, the cmu walls will be sitting on a poured concrete floor with a basement below. Any help will be greatly appreciated.