I managed to finish the parser and writer. I have a few unit tests to go, but after that I'm going to try the following

- Import an L3DT project by using the L3DT project file
--> Set height as in the L3DT project
--> For each climate in the L3DT project add a texture layer to the terrain
--> Write a tutorial how to make a fun playable map in L3DT and import it

My biggest challenge will be finding the right x,y coordinate in the ocean of texture tiles. Maybe it won't be that easy to just add a new texture layer as well but I'll cross that bridge when I get there.