Cool, I'm glad it's working, and great photos! I noticed you left out the sockets for the flash chips, and soldered them directly to the PCB. Was that to reduce the board height? Having the chips socketed means you can remove and reprogram them externally, if you ever accidentally trashed the contents with a bad update. I would feel a little nervous with them soldered in like that - a bad update would basically brick your computer until you replaced the original ROMs. I guess the chances of that are pretty low, but I sleep better at night knowing mine are socketed.

There's a tutorial on changing the contents of the ROM disk, if you want a different built-in OS or programs: http://www.bigmessowires.com/2015/02/13/rom-inator-disk-setup-tutorial/