I don’t think those turret placements have anything to do with anything ; I think they come from a complete lack of understanding of function over form, like most nonsense in Traveller deck plans. I would argue that any change that brings the ship design more in line with its stated intended purpose not incur a design change, since, if it were designed for use by an actual navy, that’s what it would look like. If it were me, the turrets and barbettes would be arranged in two 1-2-3 triangles; one barbette at the bow, two turrets on the edge amidships, and three turrets along the stern’s edge.