
I started wiring up all the necessary wires, resistors, caps and the oscillator to the ATMega328P-PU chip:

And then glued it in place:

Here is how everything looks so far:

Things left to do:
- Safe-shutdown switch with necessary resistors
- Solder the cart reader and glue it in place
- Calibrate my DIY battery monitor to get it ready (lab bench PSU + runtime)
- Put on the gorilla glass
- Some software adjustments