Planescape Outlands Topographical Map

I wanted to make a topographical map of the Outlands. This is my best effort. I made it big because I planned to slice the layers and cut it with a laser cutter, but then I couldn't export the layers as dxf unless I exported each individual piece of that layer and I just ran out of want-to. I uploaded the obj file so you can mess with it if you are so inclined.