At this point, I am going to the back.
The aft fuselage sections are simple and elegant
once the two most aft sections are joined, add the internal frame. It shapes the fuselage and support the afterburner duct
Now add the section forward joined at the star of David roundel.
fuzzy picture
joined
notice the cutout for the speed brakes. Those will be added before going any further forward ( otherwise, there will be no easy access ).
here is the AB duct
and installed in the rear
Isaac