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I wrote about this when they were proposed. According to US Army Guide books the average height of Japanese soldiers was 5 foot three and a half inches and you can bet there were not wide variations. Height is one issue the other is stature as most Japanese were short limbed so it is not just a scaled down European as usually the torso is about the same as an average European ditto the head. 22.5 mm is about correct or between 22 and 23 mms with most 22mm but get the stature ( and weapons) wrong and they will just look small.