Here is the main link I looked at to figure out how this works and gave me the inspiration for the peg board.
Step 1: Draw the grid
Using a sharpie I drew a diamond grid that teh rope will follow while creating a mat.
In order to fit larger size rope as well as small I made the diamond grid 3 holes on each side.
I drew a border around the outside to remind myself to leave room for screws and such.