Amazing work, thank you for doing this and posting your results. Inspiration!I was able to get one of these mostly built. Its missing the power switch (dont have one and is hardwired for now) and memory card slot (will do later).
It plays games ok and has sound, but something is off with the colors. I need to audit all the resister in the top left to make sure I didn't bork something. You can see the issue with the diag cart's video dac test.
Assembled AES:
Original AES:
Looks like red bit2 and blue bit2 and bit3 are missing.