Throughout most of automotive history, coachbuilders have operated alongside automakers. In essence, the marque/coachbuilder relationship has always been one of mutual benefit. Simplified, that relationship involved a coachbuilder procuring something like a chassis from an automaker, and then sculpting a unique body and interior around it. Some notable models that exemplify the process are the Aston Martin DB4 GT Zagato, which was designed by Carrozzeria Zagato in Italy. Also, the line of reimagined Porsche 911s by a company called Singer is also well-known.
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