The upper half of the fuselage went through quite a bit of a change. The engine nacelles are angled according to the central axis; the nozzle area is entirely extended, while the nozzles only are shrinked forwards; the centerline humpback behind the nose section (above the weapons bays) is split for a proper shaper; the wing roots are also prepped for a better fit with the almost twice thinned wings. The curved tails where on both sides of the nozzles are entirely reshaped. And that`s just about it with the rough cutting and gluing.
This is how it looked before:
and after the edits: