Where is the mesh held for the ALandscape class

I was wondering where I can find the C++ code pertaining to Mesh components/objects within the ALandscape material.

I was hoping there was some way to create a child of the Class used to manage the landscape mesh so that I can use a procedural mesh while reaping the benefits of the landscape editor UI… If this is impossible please let me know. Or if there is an easier way, even better.