Back in May, he built a ping pong ball LED video wall for Maker Faire Berlin. That had 300 LEDs and came out great, but at the cost of manually drilling 300 holes in sheet steel with a hand drill.
Made short work of drilling a 6mm hole in a dry wall and then putting in the screws. Can't comment how this would handle stone, but for wood it seems to be excellent” "This is the BMW of ...