Super neat bike!
Note that the Suntour Spirt (yes, that's how they're stamped,) front derailleur works "backwards" to durned near every other front derailleur ever made. The spring pulls the derailleur outward, so the front shift lever moves the same way as the rear one. T'were it mine, I'd swap the Simplex rear for a long-cage 70's Suntour, but that's because the idea of a plastic derailleur offends my sense of the Rightness of the Universe. Well, that and they shift so much better... the Simplex shifts like a spork.
--Shannon