Ok, this is far the slowest map I've ever done.
In this update I have added some buildings to the platforms, but the main thing is the sawmills and the smith. There are two sawmills, as you can see at the image, one you can actually see the wheel, the other one you can't, that's because I took jbgibson's idea of "funneling" the water, and the wheel of this sawmill is inside the house, but moving with the water that runs below the platform - The blue lines try to explain that a little better.
As for the smith, I've one at the lighthouse platform (which also needs fire), and a Woodworker building with it, and it could sound weird, but just the other day I was watching a documentary on woodworking and to make wood curve (for wheels, boats, etc.) you actually have to boil water and with its steam and some force the wood will eventually get curved. Its just a small one though, I'm planing on having a bigger woodworker house at another place too. The baker I decided to let there and the center platform, for two reasons: 1) Using well done ovens (even the hand made) the chances of starting a fire are minimum; 2) For location purpouses, being on the center is much easier for the people to reach.
I also added a school of math (engineering) and a library. I chose for the city's shield an anchor, because it is what better represents a city used mostly as a dock.
After a couple of years the rumors of a village being built over a river have attracted men of science, they wanted to see how were the people building it. Not much later those scientists were teaching math and engineering to the main builders. Some even decided to move and started living in Arcantis, after a couple of years they built the school of math and engineering (on the top-left platform, next to the sawmill), to teach young kids how to make the village's maintenance or even make it larger. Next to the school a library was also built.
The years have passed, and what was a village one day, has become a small city, though it is just as important as any great city. It is now part of the kingdom, and received a Shield: The Anchor, and above that the kingdom's three circles. Ships coming from the sea (going up the river), or to the sea (going down the river) dock everyday in Arcantis to spend the night, to buy food/drinks, or to sell their products - specially flour, grains, cereals and wood.
As always, comments are welcome