Updated 9/23/2019:
I've been working on the bench work for the River Route.
For this part of the bench work, I decided to use 1"x2"s instead of 2"x2".
Here's where the River Route bench work will go.
Here's a shot of it mounted in place.
And another of the end view. Track subroadbed (2 x 5/8" or 1.25") will meet the top of the River Route bench work (at least that's the plan).
More when I know it.
George