Wow! Things just take longer than you'd think. I probably spent half the day just making the damn cable bracket. Made it out of a gate hinge. Lot of grinding and Dremel work. I could do it again in 15min, but that's the way it goes. I positioned the solenoid just as in the pic on Entropy's bike. Had to get longer bolts and a spacer to get the positioning right. I tried to envision other postions for a long time, and finally just did what I saw in the picture. I messed with the clevis at the shifter for a least an hour. I think I got the cable cut and installed perfectly, but again, this took a LOT of time looking at it and messing with it.
Only two trips to the hardware store. First one was bolts, washers, colored elec tape, and some extra wire (and cheeseburgers). Second one was the cable lube and locktite blue (and beer). Not bad.
I'll post tomorrow on the progress. I'm taking pics of the process. Wiring begins tomorrow morning. The goal is to be button shifting by tomorrow afternoon, but you never know.