
The largest source of Kamakura period boat information appears to be in 13th century picture scrolls that appear in books and on the Internet, but I really know very little about the scrolls themselves. What they depict includes a lot of boats with hull designs very similar to the ship I’m modeling. These are semi-structured ships or junkozosen (準構造船) with dugout-style hull, which have been built up with hull planks. Most of those depicted are river boats, but some appear to be sea boats.
I recently found a great sketch of a large sea ship on a blog site. I believe this was scanned from one of Professor Ishii’s books, but it’s not one that I have.

This image is very similar to a less detailed drawing I have in my books. The ship depicted here varies only slightly from my model in that this image shows a peaked roof called a kappa at the bow. It also has only a single rail outboard of the hull, but it extends all the way around the bow. It also may be a somewhat smaller ship, given there are only 4 rowing platforms on either side, where my model will have 6.
A couple things I like about this image in particular is that it shows a roof design on the main deck house that is clear and makes sense to me. Note the boards that make up the roof run along the length of the roof. The drawing I’ve been working off of, shows the boards running perpendicular to these – not that it’s wrong, but that it requires an underlying structure that’s different from what I would naturally build. Also the front of the house appears to have a simple roll-up screen, no door or solid panel.
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