Greatly appreciate your work, I have been searching for this type of information since release and this is very useful to attempt to emulate and learn.
It is a bit more complex than just mesh.vertices and mesh.triangles as you would see in Unity and so it has been a slow start as a beginner.
I plan on taking similar approach using a circular array for a local density map. I plan for this since, unless I am mistaken, it seems useful for continuous terrain insertion/deletion and I believe I could assign LOD and other parameters to certain locations in the grid.
I hope that eventually we might see enough interest in the community to spur a procedural generation thread as useful as this one ( ://forum.unity3d/threads/63149-After-playing-minecraft )