Booleaned areas to make perfect form fitting back section of the nose back area and the nacelles and the openings for the missile bays. That is what the panels on the front section are for. In this screen grab you can see the opening without the doors.
I know some will cringe, but I love booleans. I am going to make some models with doors and hatches and crap that would be frigging impossible to model and smooth.
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