I don't know the scale of this graphic. I can estimate by proportion. If I give the office shed a generous 10 x 15 including the deck, that will make your 9' high ficus hedge 2' wide. The general rule of thumb is there is no such thing as a 2' wide solid foliage plant that will grow 9 or 10 or 15' high. Plus this skinny ficus hedge will be shaded by the office shed, the kitchen entertainment, the highbacked bench by the sauna, several small trees and who knows what else on the other side.

I know ficus from Hawaii. Not so familiar with the ficus species used as hedges in what I will take to be SoCal or close. A formal clipped ficus hedge like this is super high maintenance even if your are not trying to force it to stay 2' wide, which it won't. My estimation puts you at maybe 100' of linear hedge to maintain. I assume there are houses on the other side of this hedge that the dying cypress once hid. How will the other side be trimmed?

Basically, if this perfect, skinny green wall is not actually feasible in real life, it is a fundamental flaw in the design. That wall or lack there of affects every other aspect of the design.

A fence of course is the obvious solution, but they never grow tall enough.