The gun work behind the N3 and Nelson designs

How far had British triple-turret development progressed for the N3 and G3 designs?

Britain had useful triple-mount experience, and the G3's 16-inch work directly informed the Nelson-class armament.

A related triple 15-inch arrangement had been tested in a monitor mounting and was considered promising. The results inspired proposals for rearming Queen Elizabeth-class ships with twelve 15-inch guns. The planned G3 16-inch work then supplied much of the basis for the Nelson-class turrets. Treaty-driven attempts to reduce the mounting's weight introduced difficulties that were not inherent in the earlier concept.