Thanks for the votes, it's indeed one of my best photoshootings ever and I'm quite proud of the pic, report will follow asap
ops:
to answer salegossse's and Darkel's question, it was at the racetrack ofAnneau du Rhin. Gumpert rented the track (although there were few private cars on the track inbetween), it was a private testday with customers testing the car.