Updated 1/28/2020:
Well, I have come to a decision. I started looking at the eastern (WV) shoreline and terrain and realized I made a mistake. Back in 2017 I incorrectly specified the dimensions of Pier 1 (the shorty). On the real bridge, pier 1 is the oldest, a holdover from the second bridge. It is smaller (length & width) and has no taper. I've been trying to make my incorrectly dimensioned version work ever since. I've come to the realization that it won't. The pier will need propping up in a Rube Goldberg fashion and I'm done with that approach.
Here are some photos in which you can see Pier 1 and its siblings.
In the following photo, Pier 2 is to the left and Pier 1 is to the right. At the extreme right is the stone arch.
Here Pier 1 is to the left and Pier 2 is on the right (in the river). Pier 2 is a so-called "pocket pier".
Here's a closer view of Pier 1 taken from the river.
Another photo of Pier 1 taken from the river.
As a result of this decision, I've gone back to my machine shop with new, more accurate dimensions and expect to have a replacement Pier 1 in about 3 weeks.
I guess the next steps in this descent into OCD is to join the P1:48 cult and tear the 3rd rail out of my track. 
More when I know it (or when they let me out of the asylum). 
George
