Thanks.
That's very interesting. I note Michelotti's name in one of the drawings.
I had actually found a design by Michelotti which looked remarkably similar but with the front grille in a different position, but I had dismissed it as it was described as a 1961 BMW 1600 prototoype (pictured below). I note however that is a car which looks very much like it lurking under the picture you used for your puzzle! I guess he did both.