Since last entry, I’ve finished the sheathe! My previous entry already covered the sword wrap part of the sheathe. Now I’ll show what I did for the rest of it.
I moved onto the butt of the sheathe, and the references for the design on it were kind of inconsistent. It didn’t even seem consistent between pre-timeskip and post-timeskip, even though it’s the same sword. This is what I ended up with as a base:
The lines are done with craft foam, and the circles are balls of hot glue. After putting the base down, I covered it with Worbla. It’s actually 3 pieces of Worbla stuck together – one to cover the bottom of the sheathe and then one on each side.