Why in the world someone would do this is beyond my comprehension. The folks over at Duesen Bayern has extensively modified a BMW Z3 (1998 model) to look like close to a Mercedes 190 sl (1955), which they have affectionately called "Mystar".
A translation of their site (from Japanese) doesn’t reveal too much, but it’s quite interesting to see how they merged the two marques together.
Oh yes, the original BMW Z3 and Mercedes 190 SL is pictured below.