As Im starting to look at designs for my first warships, Im having a problem of aestetic design versus game mechanics. Hopefully, someone who has actual in game experience with this, and with naval combat, can lend some advice.
Typically, most combat type ships ( both real world naval vessels, and science fiction space warships ) mount a couple of the heaviest weapons, followed by several batteries of small support weapons. For example, a WWII Battleship might mount 9 16" guns, 20 5" guns, 60 40mm and 20-65 20mm guns. Or a Minbari War Cruiser would mount 1 Antimatter Cannon, 18 Gavitic Fusion Beam Cannons, 24 EM Fusion Beam Cannons, and 42 Electro-Pulse Guns. The reasons for doing this are many... Firing the heaviest weapons takes more resources ( bigger shells or more drain on the engines ), and often they are overkill for use on smaller ships(swatting flies with sledgehammers). Numerous smaller guns allow better dispersion of fire, usually with more precision and less chance of collateral damage or "friendly fire" casualties during large combats, and many smaller systems leaves less chance of being left helpless by a lucky hit on your main armaments.
However, as I see the mechanics of combat working here, it strongly weighs AGAINST that type of design. Unless I am missing something, there is no point in not mounting all of the heaviest weapons you can build. Weight for weight, they do the most damage, of course. Since there is no provision for energy or projectile usage, the heaviest weapons can fire just as often as lighter ones at no additional "cost". The number of targets is dependant solely on the bridge strength (and commanders, etc), so one large weapon can engage just as many enemy ships as several smaller ones, and is just as accurate. And since damage taken by a ship degrades systems proportionally instead of destroying individual systems, there is no point in having numerous "backup" weapons, since the main guns will still do more numerical damage.
Aestetically, I would love to design a Battleship with a couple of Heavy Pulse Laser cannons, a few Medium Pulse Lasers, and then several batteries of Medium and Light Beam Lasers. This is the way the ship SHOULD be designed (IMHO). But I have a strong feeling that I would be shooting myself in the foot by doing so, if such a ship (and its attendant fleet) came up against an opponent whose ships had nothing but the heaviest weapons he had available.
