The animations are half based off the PLD draw/sheathe with some amateur blender nudging to get the other hand to get the blade remotely close to where it ought to be.
Animation ought to support all models, but was 'optimized' using the vanilla midlander body and skeleton. The more non-midlander shaped your character is, the more your character will stab themselves trying to put away wildly impractical weapons. Skeleton mods might break this, dunno, I have no intention of supporting custom skeletons.