An interesting tidbit here, I originally made these 42 year old circuit boards by drawing on copper clad board using a Sharpie marker then etching and drilling by hand. Now it is easy to get boards commercially made and even find free software to design them.

Old logic and time base boards

New serial drivers and 6th nixie driver board

(Actual size is 3.75 inches wide by 2.5 inches high.)

Silkscreen view of board

Top view of board

Bottom view of board