It's taken a considerable amount of time due to life/work getting in the way, but I finally got my MB-6582 to the point where it should power up and go.
I attached the control board to the enclosure. All good there.
I made all my cables. I ended up scrapping the original idea of making them removable on both sides, the plugs didn't fit inside the case. (Just as you had thought, Hawkeye) Maybe I'll find another use for those parts one day. I soldered the base PCB side of the cables to the headers like the tutorial, and have some heat shrink tubing on them ready to go.
When all my cables were attached, I powered up. Sadly nothing really happened. I just got the same screen I originally got when the LCD started working. No lights, no fanfare... I just get a nice copyright notice from TK, and the awfully positive seeming, "READY." I moved pots, and hit buttons. Nada. I double checked my cables and it seems they are attached ok. Those PIC chips on the base PCB are already all set up to go, right? The operating system just doesn't seem to be doing anything. Or did I perhaps not hook something up correctly. I only have two SID chips in for testing, (why fry them all, right?) but that shouldn't matter, right? Did I miss some insanely obvious header connection or something? Any ideas?
Here's a couple peeks inside: