My point was solely aimed at clearing the fact that changing the grade of aluminium has no effect on the chassis stiffness. I did not mention changing the shape, and by all accounts, under what is considered as normal use, the material is supposed to keep to the elastic range of the stress scale.
If it goes into plastic deformation, and gets bent in a permanent manner, then bent back into shape, so long as the bending wasn't excessive (where it went out of plastic deformation and into the striction domain), then it will by all effects keep the same elastic properties. BUT it's likely the chassis will be slightly longer (maybe not enough to even measure it though) and if it happens too often and always at the same place (which is unlikely), it could effectively become more and more fragile and end up breaking even during normal use.
To clear things up, I haven't got a clue what the mechanical properties of the C4.1 chassis material are. I am not here to comment on whether it bends because of the choice of alloy or because of the design.
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