Sadly, this site is all in German, but from what I gather, it is a 1962 VW Transporter (or "Bully" as they are called in Germany) on a Porsche 911 GT3 chassis. One of my automotive fantasies fulfilled by someone else! The picture gallery is INSANE!!! It shows them using a Vanagon for parts of the chassis, the donor Porsche, the fabrication of a carbon fiber roof (!), etc.
http://www.race-taxi.ch/indexx.htm
*edit* it may be a Swiss website, not German. At least it is hosted in Switzerland according to my browser's nationality determining extension.
http://www.race-taxi.ch/indexx.htm
*edit* it may be a Swiss website, not German. At least it is hosted in Switzerland according to my browser's nationality determining extension.