I just got word that my PCB layout is all wrong: the MAX4468 and PCF8591T are the wrong size. So, I'm going to have to call the PCBs already printed up a loss, and get new ones done.

Thankfully, Riley at PCBWay is very helpful and will walk me through the process.

I'll change the files here (the JPG and the FZZ) once I've finalized what I'm sending (probably later today).