The example I started with is for the Cosmic Unicorn, which as near as I can tell, will be 64 x 64.
pimoroni-pico/eighties_super_computer.py at main · pimoroni/pimoroni-pico (github.com)
That’s the same number of LED’s that I have. My panels are actually arranged in a 64 x 64 configuration. I have to run them in 128 x 32 though. I’m not saying your wrong, just adding the info for clarity.
Interstate 75 with multiple HUB-75 LED matrix panels - Support - Pimoroni Buccaneers