Curious why you went with a matrix over WS2812 or similar. That PCB looks like it was painful to route!

We switched to a matrix partly for price, partly for improved reliability.

Regular RGB LEDs are a lot cheaper than the WS2812, around 6x cheaper when we made the decision to switch, which adds up when you have 768 of them.

WS2812 LEDs are much easier to route, but if one dies then every LED routed after that one stops lighting up.