Feng is begun in mission 1, and returned to in mission 5 (the last of the campaign).
The map is tight, but you need all the housing you can fit in. In mission 1 Gweilo restricts the housing to Attractive Cottages, and also disallows aesthetics (other than residential walls and gates) and medicine. This forces some demolition and rebuilding early in mission 5.
There is only one good location for the housing block, but laying it out so that it is stable (56 tile loop), and will still have perfect FS after rebuilding in mission 5, is tough. It needed a lot of saves before I got it right.
There is a bit more choice in how the rest of the city is laid out. I tried to anticipate in mission 1 everything that I'd need in mission 5, so I left space for tea farms and the clock tower that I knew would be coming. I did make one mistake, though. I had to move the mint in mission 5 to make room for all the trading posts.
With the planning done the remainder of these two missions is relatively straightforward, the key to success being to evolve the housing as quickly as possible to provide workers for profitable production and trade. The only significant challenge is the 10,000 pa treasury goal in mission 5. I started weapons production early and saved up the production so that I could export a load in one year, which (together with my other exports) enabled me to meet the 10,000 pa treasury goal before the Mongols started asking me for money.
The minimap shows Feng at the end of mission 5. The zip file includes Feng at the end of both missions 1 and 5.