Thanks Bruce for your help in sorting this out.
So, the bottom line is, that I referred to a couple of photos of an FGT chassis
for the setup at the rear (Hitch/Spring mount, Towing Cable Roller and Guides, Brackets and Plates, etc)
and the reference was obviously a Chevrolet built FGT chassis...not a Ford.
I have been doing a careful job of comparing Ford and Chev chassis,
and trying to make sure I am following Ford designs.
I am already aware of many of the differences.
And yet, I did not check to see if the Ford setup was the same as the one I was designing.
Which it wasn't.
There appear to be many variants out there, but the original Ford and Chev chassis'
appear to each have a "factory" setup of their own.
Luckily, it was not a big fix...
I was able to surgically remove the parts I had already designed and attached to my prototype build.
The removal damage was easily covered with some new surface layers printed on lightweight paper.
The new parts design is much simpler with less parts to build and install.
And it went together quite easily.
I'm glad I didn't have to start from scratch and build an entire new Frame!
But I have cut apart this Frame one too many times making changes,
and as a result my Frame Rails now have a bit of twist in them.
It didn't seriously affect installing the new Towing parts, so I am good to go.
Hopefully this is the last major adjustment.
