What would a Royal Navy Empire cruiser command ship designed in the 1920s look like, and how large would it be?
Short answerAbout 10,000 tons and broadly County-class-like because the Washington treaty sets the ceiling and the Royal Navy is already building that type.
NotesA 1920s Empire cruiser is constrained by the Washington treaty's 10,000-ton cruiser limit. The answer therefore expects roughly that displacement. Its likely appearance is compared with the County class, which supplies the contemporary Royal Navy model. No detailed alternative armament or accommodation scheme is proposed.