Morten St George Theory

[VViews]

However i cannot see anything resembling the vms castle fitting on your hill. It would need all the unexplained steep walls to be built to keep it from toppling off the back end of the mountain.

Exactly.
The topography severely limits what could be built.
There have been archaeological excavations done and the old 13thC castle plan is known. It is pretty much the same as the new one, except for an additional row of walls. An illustration can be found on page 119 at the link below:
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By the way Morten, the article explains that the water storage was not up in a tower as you presume but in a cistern on one of the artificial terraces where housing was built below the castle.
None of these inhabited terraces are visible in the VMS description: the "cliffs" are bare.

This premise of yours that "it is not known, therefore I'm right" is a logical fallacy. Especially when things are known.