This is just a quick build I did yesterday. Hull is from eBay (off an old police Lego set) Other parts are just from my collection.
About this creation
This is my rendition of an armed cargo ship, it has two machine guns, one mounted fore the other aft. Also equipped with rear-facing torpedos (the little black things poking out of the tower)and a powerful radar. Like I mentioned, pieces from my collection, hull from old set. Weapons are Brickarms (I'm in Australia, our distributor is http://minifigworld.com/). Spent a few hours on it, didn't have all my Lego with me, so it's a bit....bare.
Sorry about all the stuff in the background, room's kinda messy :).