That's a very nice bike, non-fixie.
I'm using Campi clamp-on down-tube stops and am now confronted by where to put an adjuster and whose to use. I turned a ferrule for this connection and one for the chain stay stops and they both work fine.
I should add that I inadveertantly bought an Athena 8 speed rear derailleur which I would have to say is not one of Campagnolo's finer products. I'm going to be off on a month of travel starting mid December and may want to order a Chorus 8 speed, but not until I get back.