If you use Universal 61s (or any center-pull brake), you will need to factor in the rear brake cable hanger. Standard ones will not be wide enough and the arms are most likely too short to rebend to fit. Because of the way Cinelli seat post bots fit, you can't use the more modern dangle-from-the-middle-of-the-bolt hangers. Universal made one-arm hangers, but they came in two designs. One was purpose made for use with Cinellis (I found one on eBay and am embarrassed to say how much I spent for it) and one for use on everything else. You could use the second on on a Cinelli, but t would leave the cable off-center. So the choices of which I am aware are (1) hope you can find the right Universal hanger and be prepared to spend stupid money for it or (2) get creative.

Just another example of Cino Cinelli's design idiosyncrasies. If my experience is any indication, though, it will be a joy to ride.