Two weeks just isn't enough time

This morning we met for breakfast and sketched out an itinerary. While we both favor more impromptu traveling, we realized that we need to have some idea of when we'll be where in order to fit in what we have set out to do, and also so Bob's relatives know what we'll be up to. As it stands now:

Day 1 (Monday) - arrive in Stuttgart/Waldenbuch

Day 2 (Tuesday) - Waldenbuch; perhaps tour the Ritter museum and/or Porsche or Mercedes

Day 3 and 4 (Wednesday and Thursday) - Munich (tour BMW one of those days)

Day 5 - (Friday) Ingolstadt (Audi); travel to Berlin

Day 6 and 7 - (Saturday and Sunday) Berlin

Day 8 - (Monday) travel to Wolfsburg; tour Autostadt

Day 9 - (Tuesday) Wolfsburg; tour VW Museum; travel to Waldenbuch

Day 10 - (Wednesday) Waldenbuch

Day 11 - (Thursday) travel to area near Nürburg

Day 12 - (Friday) Nürburgring (Nordschleife); travel part way back to Waldenbuch

Day 13 and 14 - (Saturday and Sunday) - Waldenbuch/Stuttgart

We're thinking that getting a five day rail pass may be the way to go for the first part of the trip, and rent a car for days 11-13. Bob is going to email his relatives and run the itinerary by them. In some ways it would make more sense to rent a car in Wolfsburg, and drive to Nürburg from there rather than return to Waldenbuch. We may need to reconsider that.