Good comments from everyone - you will want the DZ-1000 switch machines with the Ross switches.
One thing that will be new to your O building is using roadbed and having to ballast. Midwest cork.
It may be easier in some locations to put the switch motors opposite of where you have them because of roadbed fitment and allowance for ballast. It appears that you have the space to choose either side on almost all of them.
Would you care to share the file? I was trying to visualize any possible tunnel or elevated track issues. The 3D can still be helpful, even though it is not the easiest to work with.
Have you run the train simulator to check the play value?
