RE: Sig 1/6 cou mods
It would mean having to remove cover and build up the portion you want, but it's do-able. Raise the turtle deck to its appropriate height at the wing's trailing edge, and then match the profile on the wing by building up the center to match. The wing bolts might be slightly recessed by the time you're done, but you wouldn't have to touch the wing saddle or underside of the wing.