The project is to create a 4 or 6 digit Nixie HAT that is as simple to use as plugging it into the Pi and starting a simple Python program.
The project is heavily based on a modified Arduinix board that I used in my previous project - https://hackaday.io/project/16467-raspberry-pi-zero-nixie-clock
Schematics have been drawn and uploaded.
I am currently designing the PCB and will place an order to see if my design works.