Now I'm no ship expert - but - what I would like to see is something like: A slightly Slimmer War Frigate Body type, remove 2 mid-top guns, 2 mid-guns and add a few lower broadside guns and 3 more cargo hold, the slimmer shape should give more speed for the same amount of sails.
Don't know what you call it... but thats what I want to build
Edit: I just realised what I wanted - The Black Pearl Deck on top of a War Frigate Shape with the above mentioned goodies