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The process is called super plastic forming. This was first used by Panoz. Morgan also uses this process on thier new car. The new Ford GT is also going to use this process. This process has been thought about for a long time on Cobra bodies. However dies are as David said $$$$. We were quoted over million several years ago. One problem with superplastic forming is that the best alloys for superplastic forming are extremly difficult to weld.
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