This thing is fantastic, Thanks for sharing. This is one of the things that inspired me to have a go at making the station itself. I'm only about 30-40% done after nearly 3 years on and off but I'm making slow progress. www.flickr.com/uklegoman
It's weird that it's got those smooth parts up front, but the rest is rough. Also the blue on the engines is distracting. But other than that, it's pretty good. (though I don't know what the reference looks like, so maybe I'm just crazy.)
Babylon 5 is the best science fiction TV series (ignoring historical factors). Your destroyer is quite good, especially for such a complicated design. The proportions are just about perfect. If you are interested, check my site for my version of the Hyperion heavy cruiser.