We've discussed the concept of using relays and digital switching to control guitar switching, but I don't recall any discussion of that particular design. The whole idea seems a bit cumbersome just to switch guitar pickups, at least to my thinking.
michaelcbell's design has unfortunately been lost to the ether. I recall that his design used conventional switching, however.
I am quite curious about Michael's design. Between his profile here, and a bit of Googling, I may have tracked him down. sumgai (in the linked Gnuts thread) suggested that I might try contacting Michael. However, I feel if someone wishes to disappear from the web, they probably should be allowed to do that. Especially as he and I never interacted. I'm not going to build it, so......
It's a bit sad when things disappear from the Web, and even more so, when people vanish. I know it has happened a number of times here with valued members, often without explanation.