How do you line up viewports?

Now that you mention that you are using SOLVIEW generated viewports you might want to try this. Click into the respective viewports and zoom extents. I believe that will take care of your alignment issue.

It turns out, according to my experience anyway:

Construction lines were able to cross viewports in Paper Space vertically and horizontally, so basically I offset the construction lines by using through option to the geometry.

By using that technique, I get semi-permanent a visual confirmation. An object tracking method is much more ephemeral. (for lack of a better word.)

Thanks for all your help.

TMC