He built his own front brake arms from raw chunks of aluminum in order to get a cable pull from below and a low profile to clear the bottom of the main tube. Also the arms are moved to the left side to avoid interference with the chain! He used Shimano hardware, but everthing is in a different place. See the brake in the next picture to see a stock Shimano Dual Pivot sidepull.
My pictures don't do these pieces justice. The finish is such that I assumed they were high end Shimano or Campi, but in a configuration I had never seen before. Even when he told me the brakes were made from a couple of chunks of aluminum, I didn't understand he could be talking about the arms. Turns out he's a toolmaker, which probably explains a lot. Mark