2010 Porsche Panamera Body Structure. The body shell is knitted together from a number of metals. High strength steels, including Boron-alloyed (shown in red), polyphase (orange), and micro-alloyed (yellow) are used to create an ultra-stiff passenger safety cell. The voluptuous rear fenders are very deep draw stampings, which meant they had to be steel (green). At the front is an aluminum subframe (blue) designed to manage front impact loads. The hood, rear hatch, and fenders are also aluminum, as are the doors, which have ultra-lightweight magnesium frames (turquoise).