well 1200-1300 is a large span. not a ton of plate is involved yet. mostly still just mail hauberks, coifs and chausis, soupcan knees. if you moved your thoughts towards 1300-1360 you can do the splinted and plate pieces along with lots of mail. such as: mail hauberk, mail chausis, splinted or plate legs, splinted or plate arms, coat of plates over hauberk for body, and bassinets with aventails alone or with great helmets