This may or may not be useful to someone else so here is my progress to date:
I have scaled my sheet border drawing from millimetres to centimetres and disabled the plot at 1:1 toggle in the sheet setup. Personally, I really find the use of centimetres a distraction.
For my test plots at scale H=1:500 and V=1:50 it seems I simply need to scale everything on the Carlson generated layouts up by 2.0. My model space units are metres and paperspace units are millimetres.
The scale factor 2.0 I am guessing is due to the difference between my sheet scale of 1:500 and the implicit scale between model space and paper space of 1:1000 so I expect I would need to scale everything by 0.5 if my sheet scale was destined to be 1:2000.
Getting the X & Y offsets correct was pure experimentation. I still do not understand the logic involved. I used 2.5 as X offset to shift the plotted plan/prof entities 12.5 units right on the layout which will end up as 25.0mm on my paper. I used 0.037 as a Y offset to shift the plan/prof entities 18.5 units up in the layout which will be 37.0mm on my paper. My vertical exaggeration is a factor of 10 while the difference in scale applied to the X & Y offsets is a factor of 100. Perhaps a combination of my vertical exaggeration and a missed conversion from mm to cm in the software? I sure would prefer using sheet units here, even if they had to be CM
I have not begun to understand what I see with the plot 1:1 toggle turned on
I have been assisted by the Carlson support staff, they are very helpful!
Greg