Warning64 In that case, yeah, as Alpha said, shielding needs some work, and the factories should be moved closer to weapons, and the storages should be removed. Compartmentalization would also do wonders, as, while cool, the giant through-way down the center of the ship is not super efficient. Also, I believe sensor arrays do not stack, so only one should do. Finally, I'd probably add some more thrusters. It seems quite slow. To be fair, it is a massive ship, but that all considered, it still is very, very slow to do anything.
EDIT: I do really like the look of it, by the way.
EDIT 2: Also. a ship following more realistic will detract from it's overall rating of "how good it is". Which sucks, in some regards, but Cosmoteer has it's own rules, for lack of a better word. You will most likely never have a ship that is both realistic (at least within the abilities of the game) and effective, unfortunately.