Hi Ollie:
Certainly there can be some scenarios which call for the CVX vector "sloped" flattens described above.
However, a quick inspection in Google Earth Desktop Edition shows that is an area which is unlikely to require a terrain 'fix'.
https://www.google.com/earth/versions/#earth-pro
NOTE: Install Google Earth Desktop Edition and un-ZIP, then double-click the attached
*.KMZ file to 'jump' to this area
I believe you would be rather impressed with how that relatively small area could look with a custom photo-real imagery BGL.
You can use
SBuilderX to create such a custom photo-real imagery BGL.
You would otherwise have the option to merely drape a custom photo-real texture layer onto the terrain mesh at that location (which would already be provided by either FS / P3D default or OrbX FTX scenery), and blend its edges into the underlying scenery.
You could then place custom annotations of Autogen on that custom photo-real imagery area.
FYI: A terrain mesh-clinging custom photo-real texture BGL is different than a flat 3D MDL 'Ground Polygon' (aka "G-Poly").
While you 'could' still use certain CVX vector objects at assigned elevations, they can otherwise be made so that they are
terrain mesh-clinging ...in either
ADE or
SBuilderX.
You can also add airport objects via
ADE, such as "
Other Start" Locations to add Southdown into the FS / P3D airport list.
Hope this helps with exploring your options for a scenery at that picturesque location.
GaryGB