Dave,
Paul Vanderheijden here. I will be at the Oldtimer Meeting at Nurburgring as well. It runs June 16,17. They have over 600 car, side car, motorcycle entries this year. Look for the motorhome with the Scuderia Topolino banner across the windshield.
Per your other question, Guy Moerenhout in Lier, Belgium may have something in his shop under restoration. In addition, there is one undergoing restoration in Gaithersburg VA (Competizione & Sports Cars). They also have other rare Abarth cars in their shop.
Regards,
Paul Vanderheijden
Scuderia Topolino