The picture I posted after your comment (post #20) is of my 650B conversion, for which I used Velocity Synergies with Ultegra rear hub (130mm) and Shimano dynamo hub, shod with 41mm Hetres. I also was concerned about ruining the "vintage" look but I am pleased with the overall outcome, and I've also since that photo updated some of the comps to more modern ones. After a while, one comes to appreciate better technology over vintage aesthetic, and every once in a while the two can come together harmoniously.