I read through most of the guide, but I didn't see anything on this (maybe I missed that part?). At any rate, this is probably a good question to ask here.

I'm a big fan of Naginata, and in my most recent game, I've captured most of Kyushu. Shimazu's home province has a blacksmith, which I've upgraded to a master armorsmith. However, I'm wondering if like-bonuses would stack, such as if I made an encampment and upgraded it to an armory. This would make some truly beefy Naginata.

Anyway, thanks in advance for the info.