Excellent work, man. I had done only one teardown before I tackled my BSD, and that was a System 11, so it was intimidating, to say the least! You seem to have it well in hand, though, and are going much deeper than I did. Very cool to see it coming together.
And like other have said, nice work taking on a big project to save a machine from oblivion. The pinball gods are pleased, no doubt