Hello Hans, I know what you are talking about: the air intakes on fighter jets are separated from the fuselage. e.g.


So there is one practical reason why I am not doing that shape: I'm making my fuselage in 2 pieces, split vertically down the middle from nose to tail. That shape needs to be pulled from a mold. Such a mold cant have any parts that overlap when viewed from the side (e.g. right parallel view). I'm optimizing for something easy to build.

You can make separated intakes, you just have to do them as separate parts added on to the basic fuselage shape. My model jet will only be doing 200mph max, its probably not worth the trouble. It would look really cool through!