That's a really interesting, unique build you have there! The Sachs New Success group wasn't really forgotten, as they sell for high prices these days so there must still be high regard for them.
I thought of doing a Sachs build on one of my French frames, but I prefer the earlier Spidel groups that matches up better with my mostly mid 80's French bikes.
It's interesting that an Italian bike company Chose Vitus tubing for one if their pro team bikes. What kind of Vitus tubing did they use, was it Supervitus 980?