Why did the K3 design mix quadruple and twin turrets?

Why did the K3 design use a twin turret in the raised position between quadruple turrets?

A raised quadruple mounting would have imposed excessive weight, although three triple turrets would likely have been a better overall solution.

The proposed K3 arrangement placed a smaller twin turret in the raised superfiring position between larger quadruple mountings. A quadruple turret high in the ship would have created more serious weight and stability problems. The mixed battery still appears unnecessarily complicated in the answer. Britain already had a working triple mounting, so three triple turrets would have produced a more coherent nine-gun layout. The design shows how vertical weight and turret selection shape capital-ship armament choices.