You can redo the wing walk in two very different ways (and there are others as well). Another area that folks have problems with is the wing root screws (10 of them) they are #10 countersunk into WA10 washers that go into rivnuts in the fuselage side. They have been together since dayt 1 at the factory so many are difficult to get out. You might have to remove the interior to get at the back side to get them out.

AS you can see, they are painted over on top of it.

Cheers

Roscoe