@ DaveB, I am intrigued by the Retroshift, have you seen or tried it on bullhorn handlebars? I also looked at the 105 crankset but the bottom bracket could be problematic for my older frame. I will likely keep my old bottom bracket which is still in great condition but has a square taper interface.
@dkoloko, I mostly do solo self-supported fully loaded tours. The frame is touring-specific and was custom measured to me (albeit a younger 30-something me). However, when I'm done refurbishing this bike, I will probably ride it mostly close to home, which could mean anywhere around the Northeastern US or Eastern Canada. For the trips that require airplane transport, I'll take my newer, easier-serviced bike. I'm learning a few lessons sourcing parts that will work, and finally realized why my LBS advised me to buy a new bike 5 years ago!