Looks like you had an awesome time.
Btw... the 0.70€ to use the toilets, you can turn in the coupon at the shop/store and get your money back IF you make a purchase. You can even collect a bunch of these "coupons/receipts" and turn them all in at any SANI run autobahn rest-stop in Germany.
PS: You didn't go to MotorWorld across the street from the MB factory in Sindelfingen. ?