This is pretty cool.
Here's a little bit of a non sequitur, but have you given any thought to making your setting one with more magic, but fewer magicians?
By that I mean, superstitions are simply real. Magic is so ubiquitous that they don't have a name for it.
I bring it up because it might be interesting to be able to (for example) add the damage type "Burning" to a weapon simply through 'mundane' exquisite craftsmanship. You could feed into Japanese legends about cursed swords with supernatural properties and possess those properties for down to earth reasons like, "They say the craftsman used to much fire and to dark a silk in its making"