You are an awesome designer!
I too have a gazillion rulers and came up with a solution to organize them... my friend's hubby made me a 24" x 16" peg board to hang on my wall. Many rulers have large holes and hang just fine on the pegboard hooks. For the ones that have small holes, I make thread "loops" that will hang on the hooks. I also like to use the large black binder clips. They are strong enough to grip the rulers securely, and then the top part can hang on the pegboard hooks. I also use the binder clip method for hanging up my quilting stencils.