This is the best I could find, Chuck. Never seen one built, but I built its sister model in the series, the Alfa Romeo Gran Sport, which was overly simplistic with low detail and a very undersized engine. When I built the Alfa, I thought the body was also inaccurate, but it was quite good when I realized the kit was of the 1966 replica built by Zagato for Alfa – which wasn't particularly accurate to the original.
http://www.etsy.com/listing/73704649/excalibur-ssk-mercedes-car-model-kit112
EDIT: Brush up on your German for more detailed info:
http://pochermodellbau.foren-city.de/topic,289,-bandai-excalibur-ssk-1-12.html