They must be made entirely form scratch, no templates. Everything visible on this one is in fact a cannon. Two have shots that fire backwards, the one that looks like a grey version of a template ship only fires forwards, and the largest one has burst fire. MIGHT be 56k unfriendly, if people choose to show the images directly instead of linking.
ANOTHER SHIP This ship has 3 forward cannons, a back cannon, and a burst fire cannon. The long grey and red bit is the burst fire, with the first cannon behind it. The other 2 forward cannons are at the side of the burst fire. The back cannon is facing towards the back obviously.