Regarding renting a Pagoda in Germany.
Here are the two sources I inquired with. I ended up renting from Royal Classics and was very pleased with the communications and support I received from them.
A couple of points to consider: First, think about renting someone else's 48 year old car. Other than being a little difficult to start we had no problem with the car, but not knowing when services like brakes, coolant, hoses, belts, etc. were last done can be a little disconcerting when you are in a foreign country driving someone elses car. Just being with the Pagoda Group helped relieve some of that anxiety but I certainly did not have the confidence that I would have had with my own car. And it wasn't cheap!
That being said, it worked out great and added to our enjoyment of the event.
However you decide to join the group I know you will enjoy the company.
Here is a group picture. Our rental was the white one on the bottom right. (I think parked next to Tosh)
http://www.auto-nostalgie.de/ http://www.royalclassics.de/index.html