Update ...
After doing some further searching I found this thread in the A-10C area:
http://forums.eagle.ru/showthread.php?t=60815
This should really have more prominence or be in a more central location but following the first bit DON'T USE NOTEPAD, USE NOTEPAD++ INSTEAD
I went back and redid my TEST.LUA file from scratch, and fixed the aspect ratio number (I think).
And I now have this:
So it looks like I need to continue reading that thread and take a look at what appears to now be an FOV/ZOOM problem, but it's getting there.