While modern Chinese architecture is nothing to write home about, Yunnan traditional architecture is actually quite interesting, making the best of local resources and climate for some quite comfortable buildings.
The Dai, or the Tai and their Architecture and Customs in South China
China's Covered Bridges
Architecture over Water
Detailed survey of China's covered bridges in many provinces, some sections about Yunnan's covered bridges.
中国乡土建筑:云之南 - Local Structures in China: South of the Yun Ridge (Yunnan)
云南明清民居建筑 Residential Houses & Buildings in Yunnan from the Ming and Qing Dynasties