I'm in the process of building an expedition vehicle out of a Mercedes Benz 1224 AF (old fire truck). The vehicle comes with a crew cab (known as a Doka cab in Germany). The cab takes up too much space on the chassis for my build. I need to have it chopped at the rear window and resealed. Is anyone aware of any shops in the US, Canada, or Europe that do this kind of work? We found one company in The Netherlands, but they are only willing to work on brand-new trucks. Appreciate any suggestions!