This looks dangerous. Receivers generate a ton of heat and need ventilation.
Yeah I definitely wish I could open things up more but (as you can see) I'm pretty crammed for space. Due to that, I carved a rectangular hole into the back half of the part that's keeping the games up (and separating them from being on top of the receiver). The carved rectangular hole is behind the stack of games and is right above the receiver's vents. I did it for ventilation.
But yeah, my receiver gets a bit warm but it never has gotten real hot.