Your board looks great! I have been using a Pico as input-only on my mini cabinet build. Just finished polishing up the code a bit more today. It supports the buttons, either a slider pot or VL6180x plunger and an MPU6050 accelerometer for nudging. I'm not a software engineer, so coding anything takes me about 10x longer than anyone with talent! Coded mine through Arduino IDE - pretty much the limit of my knowledge. I'd like to link it into DOF to turn on the appropriate lights for the buttons, but that is beyond my skillset.
The Pico platform is great, can't wait to see your final product! My small setup works fine on this first build, but on the full-size cabinet I'm planning now, will want something with more features.
Looking forward to hearing more!
Mini cab with 24" PF, 19" BG and small
DMD. Raspberry Pi Pico controller.