What would treaty ships designed 'fitted for but not with' hidden wartime capacity look like?
Short answerThey could reserve structural and machinery space for rapid additions of guns, armour, boilers, and shafts.
NotesThe answer sketches a County-class cruiser built for a fourth turret but initially armed with three, plus provision for later armour. Nelson and Rodney could likewise be arranged for easier additions to machinery and protection, turning treaty compliance into a prepared upgrade path.