I took the measurements from this web site
http://goldennumber.net/index.htm
and measured out my MAJOR LINES for my GRID - BASED on my PERIMETER LINES - on a sheet of GRAPH PAPER. That GRAPH PAPER I tooK to a PHOTO COPY SHOP and had THE GRID put on a sheet of CLEAR PLASTIC for OVERHEAD PROJECTERS. Here is the paper copy at 6 X 4 inches they gave me - when they did my PLASTIC SHEET - as a reference. I have to adjust my scanner to keep from losing lines from the GRAPH PAPER.
This GRID has helped me greatly with my compositions. When I do my composition - overlay the GRID on any image - move it to place a cross point on any point of interest. Note where you put it - and put the cross point on your image in the same approx place - moving the crop outline until it fits the outer outline of the GRID. When that is done, move the GRID a bit on an angle and you can check how ALL DIAGONAL LINES go to their VANISHING POINTS.