Marek says the project began in June 2011, when he was handed the final pages of "The Avengers" script and told that a car was needed for Stark's parting shot. Initially the plan was to mock up just the rear of the car, since that's all that was needed for filming. But at the request of none other than the film's director and screenwriter Joss Whedon, it was decided to use a full car.
This meant that Marek and his team had three months to create a working, film-ready car in time for the scene to be filmed in New York City's Central Park during Labor Day weekend in 2011.
Deciding exactly what this film car would look like proved to be a bit of a challenge.
As you may know, Acura didn't officially unveil the NSX concept or even confirm the company planned to bring the car to market until the Detroit Auto Show in January 2012. Yet Acura knew that photos of the film car would hit the Internet immediately after filming its scene in September 2011, four months before the Detroit show. This was because New York City doesn't allow film crews to block public access while filming in Central Park.