FWIW wings can have around 1/4" in deviation without affecting their performance (In my undergraduate days I did study on the rivet height vs being flush). As for the wing movement as long as the deformation stays with in the elastic limit and does not get too many cycles there is nothing to worry about.

If you look at the design of some wings like that on the Dreamliner they have curl to them on the ground but flex a huge amount when in the air:



BTW If you are concerned with material flex in the transportation world - worry about bridges. Something like 10% of the bridges in USA are structurally deficient.