I'm writing up some rules for boats and naval scenarios in warmachine. Essentially players would have the option of fielding boats that their models are on, allowing for ship to ship combat, boarding actions, assaulting ports and such. I'll be posting the rules for that here for vetting but right now I was looking for peoples' opinions on what sort of boats to base the ships on for each faction.

The ships would be mounded on bases about the size of a CD, so we aren't talking about particularly large ships (though they could go over the edge a bit). Also, the models need to be able to have room to stand, so some ship designs aren't that optimal. I want to design the rules around a format of ship that would fit the game's needs well.

Ideas?