After some testing in fred, I must say the anti-fighter weapons are quite deadly, and all those Pirahna launchers are pure evil
One problem I noticed was the tendency of its forward beams to get killed every time it went head to head with another ship. The turrets take up almost the entire front of the ship, and tend to get hit in the opening volley of beam fire, not to mention they are quite large targets for fighters and bombers. The turrets themselves don't seem that big, but the destructible parts that are a part of the turrets make them larger than necessary. I would consider making those parts smaller, but other than that nitpick (and the shininess), I think you have a terrific model
I can't wait to see this thing in a campaign
Looking at your pic, it doesn't seem nearly as shiny as it does in game (it seriously looks like it's made of giant mirrors in game). I'll have to try some different lighting settings to see if that's the problem.