I wasn't sure i was clear in my explanation. Here's a pic of the measurement locations I am seeking. The red arrows are the rocker to rocker measurements I need. At least as close as possible. As well as the measurement from the center of one door striker to the center of the other.
Now, those "diagonal measurements" I referenced previously are represented as the blue lines. They are within 1/16 inch, which I have to assume means the tub is square at this section.
As mentioned, I'm simply looking to validate the measurements I have are at least close to another vehicle or two.