Update on Post #4. Some progress made.
I got 1 of the 4 assemblies done. I also broke my spring compressors. Had to go buy another set and ran out of time last night.
Here is the spring compressor set after I broke them. That nut that you see in the lower right corner used to be pinned and welded to the end of the threaded rod (just like the compressor on the top).
FAIL. That was the first Harbor Freight tool that has broken.
Bought these as a replacement:
$40 @ Advance Auto (with a price match).