Wow! What a great layout, and you are blessed to have enough space to build such an empire.
I have only one thought that may, or may not, be useful to you. And I can see that you are well along building the plan so I might be too late to be of any help.
Trains running clockwise on the outside loop can't enter the inside loop, and trains running counter clockwise on the inside loop can't enter the outside loop. I would suggest moving the inside loop switch located at the duckunder to the left, so it is west (left) of the outside loop duckunder switches. I think it would give you some additional operational flexibility.
I sure hope I'm making sense here!
