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Posted by Ralph Wood on January 7, 2021, 5:45:37, in reply to "Carpenter & Polmar's book on IJN Submarines..."
There is a 13 meter Chuhatsu craft:
http://pwencycl.kgbudge.com/C/h/Chuhatsu_class.htm
For whatever that's worth.
If one REALLY wants to get to the bottom of it, then perhaps investing in this book might help?
https://books.google.com/books/about/Japanese_Landing_Craft_of_World_War_II.html?id=2PWQmQEACAAJ&source=kp_book_description 
Previous Message
... only states that the daiatsu were 42 feet (13m) long and specially designed to withstand sea pressure down to the submarines' operating depth (245'/75m). Nothing about wood construction.
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