I like the design quite a bit but I have a couple suggestions. Ships look really drab if they're all grey so I'd either add more red or replace some sections with dark grey for a bit of contrast. I also think the AMS turrets look wierd where they are. I would put them closer to the center in the area right in front of the engines and have one on top and one on the underside of the ship on either side. I think they'd look better here and it'd also give you better coverage if there's a missile comming at you from below.