So concurrent with my GWH 1/72 F-15C MISIP II project I'm also taking a look at the Hasegawa F-15C (shout out to @hemspilot for bringing it up). Although accurate this kit also features "simplified" air intakes with no inner details:
I modified the kit fuselage halves and my 3D printed intakes for the 1/72 GWH F-15 and found that the resulting parts fit together not all that bad:
That's the good news!
The bad news is that the actual kit intakes all too predictively won't fit in any satisfactory way with the custom 3D printed part