Update:
I routed the shift cables to the opposite sides so they cross under the DT, like I've seen on a few projects in the Retro Roadies thread. It makes for cleaner routing around the head tube, though it looks like I'll need some of those tiny rubber cable guide frame protector donut thingies to keep the cables off the paint. It is 7-speed Shimergo with a Sunrace R30 7 speed 13-25t freewheel and a Sram PC-870 chain. The C-record rear hub re-spaced nicely. Last piece needed is a pair of Super Record brakes which are on the way from a member in Mexico. Can't wait to ride it.