Why not seam-weld the pan and body together to create a unibody?
Every other auto manufacturer in the world does it that way for a reason. The argument that you can't take it apart afterwords seems odd. Why take it apart again? If you're in a wreck that does serious damage to the body you'd think some damage would be done to the pan right? Porsche 356's are set up that way for the added rigidity from my understanding.
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