As promised, here is the attempt to Voltron all the subsystems together;
It is without a doubt, a big ugly mess.
Luckily though, it works.... sort of. The entire board receives power as intended, however I was unable to burn a bootloader onto the ATmega328P that acts as the core processor of the board. My best guess is that some of the traces on that subsystem board are non-functional. Not surprising to me but inconvenient. I will be making a breakout board to see if I can successfully burn the bootloader when I am only focused on the chip. Hopefully it works. If not then I'll spend more time in the tank figuring out what the real problem is.
Till next time,