Firing arc alone cannot determine weapon placement because machinery, magazines, cooling, access, and safety requirements interact across the hull. A dinner-table analogy captures the problem: individually sensible placements can cause trouble when incompatible systems sit next to one another. Boiler heat can expand a shell enough to interfere with the fine tolerances needed for rifling, accuracy, and safe movement through the gun. Even a remote chance of a blocked barrel or breech accident justifies careful internal arrangement.
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Weapons placement is a whole-ship problem
The closing design lesson is that weapon placement must account for magazines, cooling, safety, access, and the effects of heat across the whole ship.