The Thumbboard still had issues due to the footprint of the SKQUCAA010-ALPS. I had accidently assumed the middle two pins (2 and 5) were closer to the top pins (1 and 6), but that is incorrect. The middle pins have been moved towards pins 3 and 4. Here is the link to the updated Thumbboard. All other boards are good to go. 

But how did I discover my error?   Well, some exciting news! I have actually started programming the keyboard! I was starting to code it out in Arduino but decided to give Circuitpython a go due to the USBHID library for the RP2040 giving me some trouble in the Arduino interface. 

The base program will be completed pretty soon, chording included. I think using keymaps may allow others to quickly adapt to their own use, as well as python being a lower barrier to entry over Arduino C for those with less coding experience. 

As allows the current state of code and files are uploaded to my Github reflecting the new PCB and coding efforts. 

-Atltvhead