The idea of the elliptical planform was very likely not Mitchell’s, but his execution of it was better than in other wings, in my view. His input was an interesting sweepback (measured at the 25% chord position), the NACA 2200 series section, and what seems to be the perfect incidence and washout. It makes the Spitfire wing unmistakably different from all other elliptical planform wings.
The structure under the skins isn’t all that complex. There are just a lot of parts, but they are all easy to make. I think the most difficult parts to make in a Spitfire, are the wing nose skins, and the glycol tanks (just above the prop reduction gear).
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