I don't know how I'm only seeing this baby now. Probably because you only posted her recently.



I think that the neck was integrated nicely. As for whether she would look more balanced with a longer secondary hull, I honestly don't know, but I know that is the first thing I would have tried. From the side, the secondary hull it looks rather stunted.



I would have designed the nacelles with the same pointy goodness that you gave the primary hull, perhaps even make them a little rounded, with the nacelles thicker in the front, before tapering delicately towards the end. Doing so might have matched up better with the otherwise organic hull.



Same thing goes for making the ventral hull, or at least the "island" inside of the trench curved, rather than flat, similar to the Intrepid class. Then again, I don't think that design feature was pulled off successfully, but maybe with the shape you used here, it could be made to work.



I don't know a lick about 3D modeling (my laptop would probably crash, and might end up at the bottom of the lake in frustration!), so I'm guessing the changes you can make to her at this point is limited to details.



I'm guessing that the model is a WIP, since she only 3 phaser arrays and 5 torpedo launchers are visible at this point. If you haven't decided where yet, I'd suggest putting a pair of phaser arrays on the ventral side of the nacelle pylons, a pair of them on the tops of the nacelles (think Venture variant of the Galaxy class), a pair above the impulse drives (similar to the Sovereign), two mounted on the spine of the secondary hull above and below those two circular contraptions, a pair mounted towards the end of the secondary hull, and one mounted aft on the bridge section.



And for torpedo launchers, one launcher in the aft neck (similar to the Allegiance class), one in the primary hull facing forward (either in the hull itself, or in the bottom bridge layer, similar to the Sovereign class), one above the secondary shuttle bay, and a pair of launchers in the ventral secondary hull fore and aft (similar to the Sovereign class). You might even want to consider a pair of phaser cannons similar to the Vesta's, perhaps in that neck launcher, perhaps not.



Finally, I'm not sure about the registry of NCC-3301-A, unless you plan on doing her presumably 23rd Century namesake as well. As a rule, I think that letters should only be used on special occasions.