http://steamcommunity.com/sharedfiles/f ... =156377686
http://steamcommunity.com/sharedfiles/f ... =156377719
http://steamcommunity.com/sharedfiles/f ... =156379936
In 42.2 the Stone Processors can overlap, by overlapping them slightly, you can build a wall around your town. Just the wireframe outline is enough to stop movement so technically you don't even have to build a complete wall. If you do though, you get an epic steampunk wall of doom!
Edit: Added screenshots of the (mostly) finished village and finished wall.