FIRING
Any ship may fire once per turn with guns, and once per turn with crew missiles (bows etc.)
All fire is effectively overwatch, it may be declared at any point during movement phase and enemy vessels temporarily "freeze" in spot while firing is resolved. Firing is undertaken in the order in which it is declared, randomise order if any ambiguity. If crew have missiles you basically get two "overwatch" shots per turn, guns and crew missiles.
Markers to be placed by ships as they fire (cotton wool for guns etc.)
Once all ships have moved, all ships that have not yet fired get to do so. This is simultaneous.
Firers must be able to see at least half of the target.
Fire Arcs
Crew Missiles - 360 degrees
Bow/Stern guns - a fire lane as wide as the width of the hull (without oars etc.) projected directly forwards.
Broadside guns - a fire lane as wide as the length of the hull (without rams, figureheads, rudders etc.) projectly directly to the side.
Crew missiles fire at enemy crew in usual WFB fashion. S/M ships offer soft cover, L ships and armoured ironclads hard cover. Ignore morale.
TBD - Fire arrows? Instead of crew missiles being targetted at enemy crew?
Guns fire using traditional WFB rules. But there should be penalty for firing below your size class. Hence L ships have a penalty shooting at M, and a larger one still at S. (I'm thinking Battletech here where light Mechs survive because their heavier enemies find it difficult to hit them and more to their benefit to concentrate on the big ones).
Hits from guns are randomised
1,2 - Sails/Rigging (or other means of propulsion - magic engines, towing sea creatures etc.)
3,4 - Crew
5,6 - Hull
Crew are as you would expect. Note that crew losses might cause the ship to become derelict.
SAILS and HULL both have T and W (values TBD) dependent upon size of ship.
When SAILS are lost, ship is derelict. When SAILS are at half W ship movement detoriates to that of the next largest class ship.
When HULL is lost, ship is SINKING. When HULL is at half W ship movement detoriates to that of the next largest class ship.
Should ships have to fire at nearest target? With option to ignore nearest target if it is smaller than your class?