Nice
My wife and I recently had a 4000+ km trip to Bayern with the F20 as well. Started out with a track weekend in eastern Norway, and we had our bases in Göteborg, Celle, Nürburgring, Bad Gögging, Praha, Berlin and back to Norway through Denmark. We were very pleased with the car for this purpose.
We didn't go for any factory tours, as I spend plenty of time watching those robots work (I am one of those guys making them work) when I'm there on duty.
We did get the chance to see the peak of the flood in Praha and Dresden, though.
(Picture album with Norwegian comments can be found here for those interested:
https://www.facebook.com/media/set/?...1&l=613622034f)
I have gone along most of your trail before, and I particularly like those mountain passes. Grossglockner is one the best.