After reading the latest posts i'm getting more and more excited about 'my' rih

A few q'ns remain.

1 - what headset would match the specs of the bike.
Would that be campa (because of the lowercup) or tange falcon (because of the uppercup/nut) or a hattaswan as this headset was used on bikes with a dutch origin
My main goal is to keep as authentic as possible and not go the what is nice do it route
2 - what hubs would match the bike as the maillard helicomatic are of 82 and wrong not only because of the year ..... I have a set of shimi 600 arabesque period hubs would these be a good match with the bike

Fill me in as again i'm looking for something that could have been used from new based on the specs of the bike.

A last q'n the puzzles me a bit.

Knowing this ain't a cheap frameset due to the reynolds tubing being used, why is it that there are no cable-guides being used, but a guide clamp. I always thougth that this was done in order to save money (read: a cheap(er) frame-set).
Help me with this one.