I'm running a 3.5 version of Dwellers of the Forbidden City right now. The maps are excellent, and there is a lot you can do with it. The module itself is a bit lacking in details, but you can work up the city into what ever power struggle you want.
I turned the wizard Horan into a drow who uses the lesser beings in the city to run raids and made the Yuan-ti a powerful opposition to him as they use the city resources to try and rebuild their empire. I also added a pair of black dragons in the swamp, the pang lung was a bit "eh". anyway, I love this city and you can plop it down anywhere in your campaign world. A jungle region is best, but any place could work.