@waldo041 You are pretty close about who was involved, Rick Turner has stated in an email:
"Yes, I certainly did a lot of the work on that guitar. At the very least, I did the basic shaping of the body and neck; I made the pickups and internal hum cancelling coils, and I did all the brass work. Frank Fuller probably worked on it, and perhaps Doug Irwin as well.
Looks like a walnut top and mahogany back and the same combo on the neck. Ebony fingerboard, mother of pearl inlays probably cut either by me, Frank, or Chuck (Duke of Pearl) Erikson.
I believe the guitar was made specifically for Jerry; he was very generous with ordering new gear, to say the least!"
And in another email Rick Turner mentions Ron Wickersham, "I'd just have to know if the electronics work. Those are a very early prototype of the low pass filters, I think. That would be Ron Wickersham's work, and this would pre-date the filter/active humcancelling electronics that we used a few instruments later and Alembic kept using for many years."
I am happy to report that yes, all the electronics work beautifully after all these years. Its an amazing guitar built by the masters. Hopefully, I will be hearing from Frank Fuller soon. I would love to hear what he remembers about this guitar.