Well the good news is that I finally reached someone that knew what the car was. He actually had the opportunity to test drive it a few years back and in the one day he had it got a speeding ticket!
Anyways the bad news is that MB doesn't really have any type of build documentation that ties MB & Porsche together.
He did some research while we were talking and suggested buying a MB Production Model Book and gave me the publishers name and address. He had the book on hand and confirmed that it does show Porsche as the builder of the car and gives the specifications for the car.
If anyone else has managed to get information I would love to know how and where too look. Thanks for listening.