After a few weeks the PWBs have arrived!!!

I started with the display boards as I new they were going to be a little finicky to get everything lined up.  Managed to get the connectors all 16 boards lined up.  I may or may not have had to reverse things a few times.

All 16 boards connected.

Boards disconnected.

Now to install the discrete components, MAX7219s and displays.  After installing parts but before cleaning.

Now time to test!!!!