Well, no one replied or assisted me with my posting months ago... In case you were interested, the trip was fantastic. The family visited Vienna, Halstatt, Innsbruck, Igls, Munich and Paris.
Rented a new Mercedes E220 and got to drive on the autobahn. BMW Welt, Factory Tour and Museum were great.
. Took months of planning, but well worth it, can't wait to go back!