Solstice took just 4 months to develop.

In September, General Motors Vice Chairman Robert Lutz said he wanted a Pontiac roadster concept vehicle. On Sunday, January 6, GM introduced the Solstice roadster, and a companion coupe, at the Detroit auto show. Total development time from initial sketches to a drivable vehicle was just under four months. The key, Lutz said, was using existing parts. ``All of the major components exist, in volume, on the GM parts shelf." That would make the Solstice a …