I’m playing a little “catch up” on my blog regarding the Oguraike boat. As a reminder, this is a boat used for fishing and sightseeing in Kyōto, which was the former capital of Japan, prior to the Edo period. The boats were used until the pond was drained in the 1930s as part of a reclaimation project. My model is a 1/10-scale reproduction, based on the research of Mr. Tomohiko Ogawa, an artist and boatbuilder living in Kyōto.
Again, I don’t know the term for the bottom connecting plank, but with it now in place, I went ahead and added these mortises. On the actual boat, nails are driven into the side, to fasten the plank to the shiki, or bottom board. Nails are also driven up through the bottom edge, to fasten the plank to the hull plank. On the real boat, it would make more sense for this to be nailed first to the hull plank, then that whole plank assembly nailed to the bottom board.