wow thank you so much for the picture of the V2 bodyshell!!! I missed to visit the museum before it was closed so I didn´t know about this shell. If you have more photos of it, it would be great if you would send them to me!!
I have the dvd as well but it is some time ago since I watched it the last time but I think I know what I have to do today
As I already said I have never seen the Mopetta(Rollera) bodyshell in reality but on the photos it absolutely looks like a Mopetta. There were two slightly different versions of Brutschs Rollera (see the first two photos below) but both had a much longer front part. By the way there is no car known to exist of those two.
The third photo shows a Rollera prototype made by STÉ of France. They got the licence to produce the Rollera and built their own prototype. The bodyshell of this car still exists in Japan. The Rollera which was produced in series later has a completely different front part.
So, Otto was right to describe it as a Mopetta!