It's a really interesting ship, I like it quite a bit. I'm left wondering about the airlock, I don't think anything can attach to it other than a shuttle, the nacelle gets in the way making it so it can't be used with ship or station. Another consideration for the airlock is that it's right near the deflector, you need large equipment there, it might be better to place the airlock near a cargo bay. Maybe to the bridge deck, but not connected to the bridge it self. On the bow or aft might be good or even a dorsal or ventral airlock if all else fails. I haven't seen them yet but turrets don't fit the TNG era.
Another consideration is phaser array placement, the nacelles, which I like in appearance and placement, block the sides of the hull which will make array placement a little complicated. The dorsal part of the hull also has a lot going on so the arrays may not be able to be too big. Some fixed torpedo tubes and pulse phasers in the wing structures could be good, then the pod would just be extras, rather than necessary for a combat mission.
You might find these inspirational.
FSD: Starship Concept Art - Designing the U.S.S. Voyager FSD: Starship Concept Art - Designing the Runabout FSD: Starship Concept Art - Designing the U.S.S. Defiant http://www.ex-astris-scientia.org/sc...le-spotter.jpg http://images2.wikia.nocookie.net/me...arter_view.jpg