Thank you, Backerther, now I know a little more about the book. My father acquired it about 50 plus years ago as he always had an interest in the Japanese navy. He had some Japanese contacts through business in those days. I seem to recall as a child it was very expensive even then!
I rather think there would have been a very limited production run. I've tried to look it up in the past but never found anything. It has similar plans including Battleships, includes plans for the projected Amagi class, carriers, heavy cruisers, seaplane tenders, destroyers, submarines and even the odd gunboat!
It does include Yamato but externally more of a sketch but does provide detailed internal plans. Its an interesting book as they are clearly copies of original plans which were thought to have been destroyed.
Cheers
Geoff