Setting the limits of a no-World-War-II fleet scenario

The premise is a logic exercise grounded in prewar plans rather than a claim that all conflict disappears. British and French mobilization over the Rhineland supplies the divergence that delays Hitler's timetable without making the dictatorships peaceful. Britain is treated as the wider Empire and Commonwealth, so Australian and other Dominion capacity remains part of the British fleet forecast. Nazi persecution continues, although flight from Germany and German-controlled territory remains easier than it would be after wartime closure and conquest. War in China, a possible Japanese-Soviet conflict, and smaller European wars still generate lessons, but none reproduces the global logistical shock of 1939-45. Britain, the United States, Japan, France, Italy, Germany, and the Soviet Union therefore remain in a prolonged multipolar naval competition. Every later ship forecast depends on these political, economic, and technological limits.