I have made some fixes and improvements to the level editor lately. One of the options I added recently was the ability to load/save just the triangle & texture portions of the level. This was needed b/c I kept breaking the level data file layout, and didn't want to have to either manually convert them or lose the work.
Now that I've added the runtime-visible facets, the amount of data layout changing should be much reduced, but it's still nice to be able to grab & save just the tris & textures.
Here is the reconstructed Karnathus level, in the new level format.