I've always considered Shoho and similar designs as a little odd.
The link below is actually to models but if you click on the relevant pictures the information can be of some interest:
http://rasputin.physics.uiuc.edu/~wi...tCarriers.html
Quote:
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When launched, she was intended to be a high speed oiler, but instead she completed as the submarine depot ship Tsurugizaki . She was designed for easy conversion to an aircraft carrier, and was taken in hand in Jan 1941 for that purpose.
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