Very good demonstration of printing problems and the light. Also, I would have never thought about using an easel - very good idea. When I was printing out plans for the Blandford GB, and using my printer at home, I had to set the "properties" of the print dialog box to "ACTUAL SIZE" and that worked exactly right.
I am not sure if some of these people at the printing places quite understand 1:1 ratio - even 100% might not get it. However, a person would have to go into "their" printer mechanism properties to see the different manners that it could print. I bet there is a setting for ACTUAL SIZE scan or whatever. Just my thoughts.
Now, on another note, I studied my plans last night, and it's going to be a "thought process" for me to understand.