Here are a couple of shots from two sets of models that I whipped up yesterday. Note that they currently lack any textures.
Following my decision to go big and physically-incorrect, I've created new assets for a farm set and a mine set. The farms (first picture) have fields suspended in the air from giant metal rings, and are fed water from tanks. The player's path will cross by a few of these fields, though most of them will be there for decoration to give the impression of an expansive farming community. Some other field models will be built for resources that grow on vertical surfaces. There will also be granaries, farm houses, and sky piers.
The second set is for a "mine" area. Mines explain where metal and stone resources come from. Players will be able to step slightly into The Wall from these mines. The super-structure that extends from The Wall includes a storage platform that is connected to a short pier. Above the pier is a rail for a crane.
Will be working on some brick types for the rest of today. Will keep everyone posted!