Here's Schematic:
and here's the planned finished product.
and here's the PCB top side:
and here's the underside:
and all from this breadboard "design"
The most recent arduino file that worked OK,I think, is:
C:\Users\Dell\Documents\Arduino\PB_Sketches_May20\CDP1802f03\CDP1802f03.ino
Which is in pastebin here: https://pastebin.com/xHTkrFR3
While waiting for PCB's to arrive, will plan two Nano version of Cosmacuino.