Re: chisa katana vs kokatana
I've never actually heard those terms used by anyone in the JSA. I'm sure someone might, but it's pretty rare. Among collectors there might be more distinctions given, but from a modern/JSA perspective, it's more about relative size to the practitioner and less about absolute lengths. When I go to Japan I always borrow a sword from my school there to cut with, and while it's a 'katana' in their eyes, it's almost a wakizashi to me since it's about 3-4" shorter than my normal blade. Very awkward to noto correctly.