I roll with this idea, although I have a range, smaller, faster ones for fighters.
My turrets can rip through anything Battleship sized with eaze, I have 68 and at least 8 of those do upward of 1000 damage. The rest are something like 800-900, 700-750, 600, 400, 100-200. A wide range for versatility.
My ship is 432m long, 77m high, 140m wide (approximately, can\'t remember exactly) and looks pretty full turret-wise, they are not small turrets, six of them are the equivalent of a cruiser in size, except almost entirely AMC blocks.
(this is all rough, Don\'t take any of it as exact fact)