Updated 7/4/2019:
Happy Independence Day everyone!!!!
Today, I focused on construction of the sub-roadbed for the Pennsy Cross-section (eastern approach to the Stone Arch).
In these next two photos, I'm clamping the longitudinal stiffener for the side that will be closest to the viewer when the section is flipped over.
Now I am positioning the other longitudinal stiffener. You never have too many clamps!
The photo is a little blurry, but you can see that carpenter's shims are our friends!
Finally, I added a diagonal brace between the 90 degree cross-members. I think we eliminated any chance of roadbed deflection.
More when I know it.
George