I made a couple small breakouts for some of the parts to make it easier to breadboard the design. The ATmega328PB, 24AA256, and ISP programming header got nicer milled PCBs and the APA102C RGB LED got a horrible melty perfboard breakout.

On the code side I just made an LED blink and then got a picture on the LCD screen by writing a simple driver based on the one from Adafruit.

The code and breakout boards can be found in the project repository on GitHub.

Next I'll probably wire up the rest of the hardware and write a little code to verify that each part works as expected. There's a lot of CAD and programming to do in the next two days.