Another strange bug I've seen is that the normal Nodachi sheath when the sword is in your hands goes all wonky, hard to describe but it has like grey lines vertically. I didn't screenshot it, it happened when my brother installed it too so I imagine others might be seeing this aswell but Im not sure. Great little add on though can't wait for it to be complete !
edit: the +1, +2, and +3 versions are fine but the normal nodachi sheath is weird when the sword isn't in the sheath.