You could use Irregular's Vauban walls and glue two of the same type of wall lengthwise, to give yourself a Great Wall with battlements on both sides. Not sure how well the towers would fit when the walls are double-wide, but they might work.
Paper Terrain has a 6mm tropical village, so grass peasant huts if that fits with your project.
You might also scour pet stores and dollar stores with pet sections for aquarium pieces with an Asian theme. I have a tall Chinese tower that probably best fits with 10mm, but could be 6mm in a pinch, and the smallest of those Buddha's stone heads might do too. There may be more I've passed when I wasn't thinking of 2 or 6mm; some general castles might work as well.
For 3mm I've used a "finding" (in the bracelets section of craft stores) for the top of a pagoda:
link
I also made stilted huts with stables and plastic Monopoly houses; I've also texted the roofs of Monopoly houses to turn them into huts. They're also in that blog post and this:
link
I don't think any of the Safari Toobs with buildings had anything more Asian than the Taj Mahal, but I might be out of date. My final thought is that there was some free paper terrain of great buildings of the world that might have had something Asian in it; there was the Taj again at least.
