MrLeftHand The closest to concentrating missiles in a small area I've seen/built is a U ship.
(for example see the ship of mine that Mc2 posted a bit earlier in this thread https://forum.cosmoteer.net/d/2489-upgrading-your-ships/246)
Missiles don't turn that fast so to get a higher concentration of missile would probably require a ship that is bigger than the 100x100 build grid.