Hi,
so, I tried to form one of the not-straight elements, but I had no luck. I tried the modifiers you mentioned, but the first problem is to fix all four points to the edges... another thing is, the deformation is not symmetrical. I attached a screenshot the one element, two sides are already build and ready, the other to should be formed like the green line. Do you have any tips? That would be great!! ah.. and the thing should be closed on the front and back, so there another deformed plane should be placed.