In Empire: Total War there are several armoured units that have a 16th to 17th look to them, including spearmen (from AUM I think), riflemen (from Jamestown campaign) and cavalry (Hakkapelita). There are also several other units from the era in The 1600's mod (http://www.twcenter.net/forums/showthread.php?t=409802) by Shugo560.
If someone could get some of these units into Shogun 2 and make them recruitable from a Nanban Trade Port it would be so awesome. I know there would probably be problems with the animations and that it's not historically accurate, but it would be a cool feature.
Tell me what you think!
PS. I know there's a thread about adding a european faction, but I figured this is different since it's only adding a few extra units.