Bob came to my shop many years ago and measured everything including nuts and bolts of the Jungmann in my shop.
He brought this to a local flying field and sent Long and I an invitation to see it fly.
Bob has passed away but his many scale models are still flying. I must have gone through two rolls of film back when you needed to get them developed.
Fifteen more pictures are in a new phonto album "Models" , accessed via the Gallery menu item top left.