Two different styles of LED pixels are used in our show. Bullet-style pixels make up the roof line, and square node pixels are used elsewhere in the show.
I started with the bullet pixels, which worked out really well in along the roofline where space is not an issue. The pixels are ~ 1.2" deep behind the mounting surface. Measurements indicate the square nodes could be placed with 0.7" clearance behind them (the wires need some space to bend).
Node Style Pixels:
Bullet Style Pixels: