Brakes forget cables.. My Current favorite : Magura HS 33 The hydraulic rim brake
http://www.bikeman.com/BTI-MU7811.html
fits on the Brake bosses for cantilever /V brakes ,
but does not use it as a pivot, as the pair of slave pistons move in a straight line.
A More compact double : Velo Orange, 46/30. get the BB from them, too
they will get the right one to match their stuff
with 12t cassette cog, high is covered, 30/34 should work for low.
Bar end shifters.. converted to Thumbies with Pauls adapters.