Well, i am not sure you can find a firmware for that old schematics.
But I started with that minimal schematics 4 years ago, maybe it was named coffeetrack.ino
And that old ino does not work with new 5.72 AOG program.
You must rely on all the users here, and order a pcb.
You could start with pcbv2 or the kaupoi v4 (they are much alike)
Or go the newest way and get the AIO board.
The all in one here.
The boards can be found on farmerbriantee github, same place as the AOG program.