Finished, for now anyway - son's high school bike.
Thanks to herroberst for contributing the Gatorback urban assault tires!
The bike is tout Mavic of mixed eras: the bits that came originally with the 1986 bike, and other newer Mavic bits. Practically everything that the bike needed came from my parts bins (or Mike's): 840/860 derailleurs, 821 shifters, 440 levers, pedals (dual cage/SPD type), cables and housing, replacement MA-40 rim, longer Mavic stem, seven speed freewheel . . . all I bought were the chain, bar tape and bar-end lights. The bike itself was a Craigslist find.
Bike rides like a dream - fast, quick, light. Columbus SLX. Son loves it. Named it "TM" which stands for Tour Mavic, but "Markus" to its friends.