For the ease of repairing / exchanging parts the wings were divided in parts.
The 109 wing is also fixed on 4 points, but directly at the wing root.
That was possible by attaching the main gear to the fuselage, resulting in a different can of worms.
Only the Spit, afaik, had the undivided main spar at this time.
There might be more planes with this attribute, but then i dont study wings, except through the ReVi.
