This should really be mentioned up-front, but the Red Sabre Boss has his regular "Meitou Horse Chopper" replaced with a "Two-Handed Sabre" by this mod.

So, if you're using this mod, you seemingly can no longer acquire all the vanilla Meitou-grade weapons. I don't know if this is the only vanilla meitou weapon replaced, but it seems highly unlikely.

As soon as I verified this, I uninstalled the mod, imported an earlier save, and got my Meitou Horse Chopper.

I'm not saying the mod is not worth using, but keep this bit of info in mind.
It's really something that I think should be mentioned clearly in the mod description.

Adding new Meitou weapons to existing characters is one thing, replacing pre-existing ones is another. I don't want to lose out on vanilla content just so I can have new stuff.