This project is pausing through the end of 2025 because I am sending in the Core64+Neon Pixels demo to be displayed:

https://hackaday.com/2024/08/26/supercon-2024-show-off-your-unique-display-tech/

The next phase of the project is to build the big-banging required to drive the Serial Shift Registers. That should relatively straightforward since it's not much different than the code to drive the Neon Pixels.