that's really cool rengers. top notch work here. I can see the century class influence in the nacelles, I think.
Some c&c
Try making the deflector area pull towards the center a bit more, it will make it look more streamline.
One other thing I might do if I were building the ship is widen the nacelle stance. Because they are short nacelles, and the ship has a wide body, I think it would look more stable if the nacelles were moved outwards about 50%.
I really like the humps n top of the saucer that run along the Y axis.
I've gotta say, the front end view of this ship looks great.