Status 7/17/2020:

Parts arrived! I just built up the first board. However, I somehow forgot to order a simple 3-terminal voltage regulator! Argh!!! So, that's on order now. The rest is together and everything fits - I just haven't powered it up yet.

Status 7/14/2020:

Blank PCB fab: I'd ordered these months ago - only just now do I have a little time to build one.

Components: Just ordered enough parts to build 5 prototypes.