I need all of your expertise here, so I immediately placed this puzzle in the professional section.
Found in a german forum and with the allowance of the guy who posted it there I hope we will find out more about this unique car.
My guess would be that this car could very well be Steyr based.
The rear wheel look like Steyr XXX and the front wheels like Steyr 200.
The bodywork seems to be a remininiscence to this well known streamlined Spohn Maybach.
Can anybody help? I have revealed all I know so far...