Charles:
Here is how I think it can be done. The lower center section has to be used from an F kit, there is no way to use the D wing center section because the D is much deeper in the fuselage than the F. I separated the wings from the center section at the panel lines that have all the holes between them, that is where the full scale Sabre wing attaches to the fuselage. Using the Academy F kit and the Revell Germany D kit the fit is excellent. I haven't tried the Hasegawa kit, or the old Monogram F kit yet for fit.
I have the Aeroclub resin conversion for the initial Sabre wing, and it will be more work than this is. The OP Cutting Edge set was the same. You have to cut the wing from root to tip and also modify the tip to get rid of the 1 foot extensions. Not for the faint of heart, especially when an nmf finish is needed. Then when you are done you still don't have the proper wing sweep, as the D kit is much better that way.
Rough cut on the Academy wing:
Rough cut on the Revell Germany D wing:
D outer wing panels attached to F center section. I filed and sanded up to the double panel line edges to keep the join precise, keeping the wing join panel line on the center section and losing it on the wings.
Initial fit of upper wing panels to fuselage. Some care will be needed to keep the slight dihedral the Sabre has.