Nice, but sorry if I ask, did the hull comes from the Shimane Maru and the bow from the Yamashio Maru drawings?
I would say, that indeed at least the aft section comes from the Shimane Maru, and thus yourself needs to be credited.
About the bow, I'm not sure, but it looks very similar.
It should be from scratch (since I don't recall even referring to either ship), but then I've been working on this design for over two years now. Might have missed it. I'll rework the aft.
Bow is definitely from scratch, since that's the last part of the hull I drew, about five months ago, during when I looked at various drawings of Ryujo.