You look like your building my ideal bike for china. That Truimph would be my ideal bike for life, definatly a keeper that one!!
Here's a link to a post i did a few years ago.

http://www.mychinamoto.com/forums/sh...5-XTR-Lowrider

It was chinaV's old xtr and i wanted something cool to cruise around on and go to the beach, shortly after it got put back to dirt bike dutys and is now owned by serpenza here in shenzhen.
The galaxy wheels are beautiful and the brakes were always great, i was toying with the idea of a lowslung pipe too. it would be a good basis to go from, the only downside is the front end geometry and the smallest spocket you can put on the back is a 41 tooth.

have you had a look at Honda CB400SS ? they are available here in china and are a basic single cylinder bike with an electric start XR400 engine and spoked wheels.

also look for a honda VRX400 thats a retro roadster vtwin with big brakes alloy rimed spoked wheels. both these bikes would make great base bikes if you could find a cheap secondhand one.
Last year someone was selling a VRX400 over in Kumming for 8000rmb it was matt black and looked gorgeous but i was too slow and missed it.

Good luck with the build. Rich