Jay
You have a great operating track plan.
I would have a concern about how close many of the tracks are to edge of the layout. Any serious derailment may allow the trains to hit the floor. Having at least 6 inches of distance from the track to the layout edge would be much more safe. A larger distance from the track to the layout edge will allow for some type of scenery, small buildings or train items to add to the layout.
You may not have made all plans for more layout details and you have several large areas between the loops. I would consider adding a turntable and round house. A TT and RH were a must on my much smaller layout and adds extensive operation and play possibilities. My turntable is homemade and round house and cost only $10 each to build so cost does not have be an issue. Details of my are on my profile topic list.
Charlie