Hood's 5.5-inch guns and alternative cruiser weapons

What could replace the 5.5-inch Mark I guns, and what targets were they meant to engage?

Twin 6-inch mounts were an alternative, but Hood received 5.5-inch guns because weight was the deciding constraint.

Twin 6-inch mounts of the type later fitted to Nelson and Rodney are offered as an alternative to Hood's 5.5-inch guns. The viewer also asks which targets the smaller weapons were intended to engage, but the reply does not develop that part of the question. The answer instead concentrates on the design constraint separating the possible fits. Weight was the deciding reason for accepting the 5.5-inch weapon.