http://www.dakkadakka.com/dakkaforum/posts/list/69.page JForum - http://www.jforum.net
My Google-fu is lacking and hasn't yielded any inspired results. -_- ]]> http://www.dakkadakka.com/dakkaforum/posts/preList/644738/7755864.page http://www.dakkadakka.com/dakkaforum/posts/preList/644738/7755864.page GMT
I'd pose this question on the Historical Forums...it may take a while, but you're bound to get responses.

Or maybe the WHFB forum has good ideas for conversions for Empire forces.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/644738/7755895.page http://www.dakkadakka.com/dakkaforum/posts/preList/644738/7755895.page GMT https://www.kickstarter.com/projects/2104924145/28mm-ancient-chinese-warring-states-qin-dynasty-mi

I also found this:
http://www.renegademiniatures.com/qin.htm
and this:
http://www.essexminiatures.co.uk/collections/25mm-ancient-tang-five-dynasties-chinese

There might be more, but this is all I could find in 28mm.
Also, you might consider asking this in WHFB, historical or misc. forums rather than 40k.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/644738/7755948.page http://www.dakkadakka.com/dakkaforum/posts/preList/644738/7755948.page GMT
Though really, you would be getting a lot more replies if you had posted this in a historical forum not 40k
]]> http://www.dakkadakka.com/dakkaforum/posts/preList/644738/7755996.page http://www.dakkadakka.com/dakkaforum/posts/preList/644738/7755996.page GMT