I've got a Nippon warband made up of Clan War minis on my painting table right now.
Awesome minis, just waiting to build my skills up a little to do them justice.
Although I did add a GS eye-patch to my captain so he could be Date Masamune
I plan to run them Reiklander cause in my opinion it is the closest fit rulewise. I'm even playing early-Nipponese and self-restricting black-powder.