Wow. That conversion bike is -indeed- incredible. Any more pictures?
Whoever asked about the R7, there was a fairly extnsive write up on it in the Vintage BMW Motorcycle Owners Club forum some time ago. Interesting that no one really knew it existed for sure because hints at it's existance where only artist renderings. It quite surprised many people when it was found in boxes.
LOOK OUT IT'S COMING THIS WAY!