Why a supercruiser must fit dockyard infrastructure

Should a three-turret British supercruiser be stretched from Renown toward Hood's length?

Probably not; a Renown-sized hull better fits existing infrastructure and can still carry the machinery and support spaces the mission requires.

The proposed design stretches a three-turret supercruiser toward Hood's length, although that extra hull may be unnecessary. A Renown-sized vessel can contain the required machinery while leaving useful space for maintenance, support, and ship services. Hood-sized ships also compete for a small number of docking and repair facilities unless the program funds new infrastructure. The best individual design is not automatically the best fleet design when bases and dockyards cannot sustain it.