Porsche-Beutler 696 Spezial Coupé

48 is to early for it to be porsche based and tbh to early for it to be vw based as well. yes they had started production then but it was very limited and the chance of getting hold of one and then rebodying it would be slim. even early 50's the cars were in short supply.
the porsche of the time the 356 was at the start based on vw running gear but had a monoque body unlike the beetle that hand a floor and body that bolted together. once the porsche got up and running it used all porsche parts with nothing of the beetle running gear., they had there own engines, gearbox's and suspension. some of the electrical parts changed over between modles but not a lot did.
there were a few coach builders that took a vw floor pan and made a body for them Karhman being the most obvious chocie, they also built the porsche 356 bodys for porsche.
i'll do some digging on that car above and see what i can turn up.

"This special body of the Beutler brothers in Switzerland could either be ordered with either Volkswagen or Porsche technology. The first models were manufactured 1957-1958 and in 1962 was built on the basis of the Porsche 356th Four-cylinder boxer engine - air cooled - 1582 cc - 75 HP - Maximum speed 165 km / h. Original price £ 19 750 at that time."





www.wolfsburg-citytour.de/wolfsburg-tourist/Zeithaus_1/Porsche-Beutler/porsche-beutler.html