The first approach was selected allowing AMC to use its existing technology and unibody manufacturing expertise to make fairly inexpensive modifications to the Javelin approximating the prototype's styling and proportions. The automaker could turn out steel bodies in large numbers, so it rejected developing plastic (or fiberglass) bodies because those are intended only for low-production models.[12] The first fully operational unit debuted as part of AMC's AMX project in 1966. The once-"frumpy" automaker jumped on the "pony car bandwagon" with its "attractive Javelin" and soon introduced the "unique" AMX featuring a design where "hoods didn't come any longer, nor decks any shorter".[13]