First, I took a 2'x4' sheet of 1/8" MDF board. I drew 1" squares on them.
After that, I took my jigsaw and cut out all of the zones. Here's what they look like after they've been cut and the edges have been shaved down.
After this, I took 3/4" pink insulation foam, cut out the 2" by 6" or 7" rectangles, depending on where I needed them. I then glued these on with wood glue.