The circuit on the proto-board is working but it is time consuming to build and leaves open the potential for human error in wiring.  So we decided it was time for a PCB!  We're using the OtherMill Pro to mill these.  The first attempt looks great but unfortunately it doesn't work :(  

I'm checking the wiring but good news is that we got one failed PCB design out of the way - probably only 1 or 2 more attempts until this works :)