Very interesting! I was thinking just earlier how cool it would be to have a Warband mod based on the Sengoku Jidai. I will be keeping an eye on this mod
By the way, perhaps it's not very important, but I thought I should point out that the Japanese term for a bow is
yumi(弓), not "yami."
Yami means "darkness" (闇)
PS. In addition to armor, will you be adding traditional clothes? IE:
kosode,
hakama, perhaps even
hitatare-sugata for upper-class soldiers? Granted, these things would usually be worn under armour -- not by themselves, on a battlefield. But, still, if you're interested, I can give you plenty of information on clothing of the era.