Not sure what you need so I just spit out a bunch of information.
Here are a couple of possible wonders taken from the Artuaghin Gazetter:
The World Elevator:
In the center of the territory ruled by the Bear Clans, a mighty wooden machine has been built. Stretching from the top of the plateau to the foreests below, this device is the mighty elevator designed to allow access to the top of the Atruaghin Plateau.
This device was designed and built by the Repiublic of Darokin in exchange for the exclusive rights to trade in various commodities produced by the Artuaghin Clans. It consists of a pair of solid wooden platforms, each large enough to hold three large wagons and their teams, linked together by a long steel chain. When cargo is to be raised or lowered, a counterweight is placed on the other end of the platform that roughly balances the cargo. A crank atop the plateau is turned and with the weights being roughly equal. The transeference is made with little difficulty.
Artuaghin Mystic Conveyor
This device will transport up to 10 people to the hollow world - the device as shown behaves like a modern day elevator.
As for units, Shamani (aka Shamans) have a large amount of power in this society so that is a potential unique unit.
Some of the different tribes also have posisble unique units:
Children of the Horse - Mounted lancers (no armour)
Children of the Elk - Skirmishers handaxe and shortbow
Children of the Turtle - Leather armour and spears have large sea going canoes.
Children of the Tiger - think aztecs - metal armour and weapons + poison