Black would look better than two different colors. I have a set of very nice blue tires that don't match any bike I own. Don't know what to do with them.

I am under the impression that all in-tube cable routing has an internal tube brazed into the frame tube. How would you rout a cable that was removed without one? I would remove the RTV and clean it up. If you ride in the rain a lot, this could be of some concern. I don't know what the cable tube material typically is, I would use steel or brass, both of which could have corrosion issues over time, hence the applicaiton of the RTV.

"Ceramic" coatings were an option on the same model rims. You should use different brake pads made for them. The "Ceramic" should not be confused with dark anodized rims. Some do confuse them, they are different.

A bike can have a lot of replacement parts changed over time, often wheels and or rims as a result of damage.

Great looking bike. I happen to have an affinity for Colnago's and hope in time to experience some of the different models of the 80's. My 83 is a Superissimo, which I really enjoy. Went for a 33+ mile ride the other day. It felt like it would coast up hill. My next one will have to be a version of a Master.