I've received the PCBs and I'm pleased with the product. So far, everything appears to function. I'm able to detect the FT230X from my ThinkPad and my PICkit 5 can detect the ATtiny3224 through UPDI using MPLAB IPE. I'll start development on the software when I decide that it's a good time to go through the PIC18 code for the original mancala board and port it to this application.