1/4" Plexi Glass sheet (had on hand from another project)
Dymo Label Maker
Nuts and bolts in the following sizes (bolts as short as you can get for the size it comes in)
Step 1: The Layout
Once I had it cut down to size my next issue was how to mark my layout without marking the plexi itself. The benefit of using the plexi came in nicely here. I just took a piece of paper and laid out a 1" x1" grid pattern on the paper and set it under the plexi on my workbench.