With COVID lumber prices I set out to build a piece of furniture using a single sheet of 3/4” plywood. I built a floating TV console to hide all my A/V equipment for a nice clean look
I'm looking to do the same thing. Great cutouts on the speakers and very nice subwoofer placement. I don't know about the receiver being closed in with no fresh air getting to it.....
I used a French cleat made from 1x material. One at the top and bottom of the cabinet so it sits flush with the wall. You can see it around the 4:28 mark