I hate to take the wind out of your sails, but that is DEFINATLY not a Factory Convertible
There are a number of very critical reinforment areas on the Factory cars that are not on the standard sedan verson of the beelte. Case and point is to look at the doors in the photos. They look like they are sagging and binding at the top edge. The Facory Convertible has beefy reinforcing rails that run the entire length of the pan to prevent this from happening.
I agree with justdubbin, stay clear...
Doug
PS VW (or Karmann) didn't make convertibles, they made Cabriolet's. The difference is in how the top is constructed. A convertible has a single layer top, a Cabriolet has a outer layer top, padding and a headliner.