Guys long ago the full scale convention was to include any area covered by the fusealge just to keep the computations simple and to have one standard.

In your discussions here you've already implied that now we need yet another standard to determine at what point do we include or disallow the area under the fuselage.

Then take a more extreme example, both the F-4 and the F-106 have "coke bottle" fuselages, do you do the caluculs to determine the exact area of the curved wing surface that occupies the open area created by the coke bottle curve?

The A-4 Skyhawk has inlet duct overhanging the wing to body area. Is that portion of the wing lifting or not? Do I count it or not.

Remember the purpose of wing area is to give you a number to work from, it is a generalization. You are aparently trying to apply a micrometer to an inexact number.

MYC YMMV

Tom S
Aero Engineer