The Victory Class destroyer was first added to thae navy some 200 years ago. With some modification, they still fight on the Iron Crusade today.
About this creation
The Victory Class destroyer is a battle tested and crew approved medium warship. It has one large cannon mounted on the top, used to break the hull of ships that are twice it's size, sheilds and all. It is relitivly fast, and has decent manueverability, but what crews like most is that it is the most important thing: LUCKY. Out of the tens of thousands of Victory destroyers manufacured each year, only about a third are destroyed. Considering the brutality of space combat, this is a remarkable number.
Probably your best large-scale warship. The combination of sleek and boxy is right on, but Tim is right about it needing an interior. Also, there are some bits that look incomplete-- they need more detail or at least "filling in". Overall, though, it's a good design.
The ship exterior looks good, but something that large needs an interior feature or space. It doesn't necessarily have to be a full interior crew berth, but anything like an escape pod, vehicle, or pop-out weapons would work.