I also learned to know Martin via Stefan. He owns a small but superb saddlery North of Frankfurt. Martin and his team are doing their works with love and passion and the results are outstanding. As I am writing this, I got the dashboard and the centre console back and it looks stunning.
He will also do the seat bench and - once the car is finished mechanically - the door panels, the persenning of the cargo area as well as carpet and ceiling. Really looking forward to that and he can be highly recommended.
This is a link to their website (German only).