Really cool Bates, ZB! Congrats on the find. Definitely a head-turner. I think it looks good with the NR parts. Maybe just change to a TA Cyclotouriste or Stronglight crank if want a smaller ring up front, or get one of the SOMA long-cage kits for the RD and add a wider range freewheel?
You mention it is very lightweight. Out of curiosity, do you know the frame/fork and/or total build weight?