I think aluminum would be okay at that temperature. It all depends on how well you back up the dies, and how thick they are, as well as how heavy and strong the stock is going to be.
The shape is not really a problem if you have the right software to accomodate your model.
Don't forget to allow for springback of the stock, if it is undergoing elastic deformation. Don't forget to allow for stock thickness in the offset between your dies at shut height.
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