Nice F1 pics.
I don't know if that car is really based on a BMW F1 car. My gut says no. Here are a few pics of the older BMW F1 cars seen at the 'RingWerk Museum at the 'Ring. (sorry your gonna have to scroll thru alot of pics!)
There was an older F1 car next to a MB F1 and then an exploded BMW F1 model. If you count the horizontal slots in the rear wing... the BMW has four while your F1 car has three. ?
Grüne Hölle Musuem und Ring....