Meshing Technique question

@Robert A few years ago I manual created a mesh terrain. Your case looks similar.

I didn’t mesh modelling like this in the last time and so I’m not sure what is possible at the moment. I think it’s a question which mesh tools can be used. Weaver Bird is a great tool and I would look at the Rhino 7 SubD section.
https://discourse.mcneel.com/c/serengeti/sub-d