Because of Svip I have a bit of a hard time cheering for Ferrara. I think I can make an exception though
You've done some seriously nice work consolidating Italy with an OPM, way better than I could ever do!
Nice work! You've expanded rather nicely -- Sicily is another excellent target, as it's outside the HRE (depending on whose friends they have). When ever I play an Italian game, Milan is usually the mid-game boss, so you should focus on them as your long term enemy.
Excellent work so far!
You should have vassalized Savoy, but good job nonetheless.