The machinery risks inside the Lyon class

How practical was the French Lyon design with four quadruple main-battery turrets?

It was possible, but immature quadruple-turret machinery and a difficult internal arrangement would make the ship unusually risky to build and maintain.

The Lyon design is judged possible, but four quadruple turrets would demand first-generation machinery built with First World War technology. Quadruple mountings remained difficult even with later engineering, and the proposed engine layout also prompts concern. A Queen Elizabeth or R-class turret arrangement is preferred to the proposed ABWX distribution. The question's 305 mm calibre is corrected to 340 mm, or 13.4 inches. Maintaining the complex mountings would add another difficulty for the crew.