Looks great Herb.
Sounds like a wonderful piece of property and plans of action.
Nothing like having a "man cave".
Our phones are intercom so it's nice to have communication to/from the house.
I didn't have that in my old studio. I also didn't have a security system. What I did do when building it; I made the windows narrow and long making it almost impossible for a thief to use. I stored all my guitars in hollowed out Coke machine. Those things are like a safe.
It had one very solid door with deadbolts that took a key on either side. Very bad thing for a home but fitting for studio. I figured if a thief made it in it would have to be thru a wall. If small enough to fit into via window he'd have to exit that way too and that would be very hard handling equipment too. Very time consuming and we know that's a major factor to a thief.
All windows and door face the house and also had a yard dog that one really didn't want to deal with.
"Power" is an important factor. I'm sure you've got a handle on filtering and stabilizing it.