1. check train time venice to cinqui terra.
2. i don't think one can tour cinqua terra by car(i've never been there and cannot spell it)(i try to avoid stevens).
3. you cannot afford to park a car in florence, even if you could.
4. rather than racking off a been there, done that with most of the time on wheels, what do you want to do and see. i.e. do you like all that early art and gutted saint pictures that are in florence?
5.5 if you are going to tuscany to tour those vineyards, most of them are closed by nov, and the weather can be pretty crummy.
5. others comment on como in Nov.
6. nov in venice is high water season. that ok with you? (we stay 10 days at a time in venice, and have no interest in florence)