Step 1: First Things First, an Outline Needs to Be Made. I Simply Used a Ruler and Pen and Made a Grid of 20cm Squares. X~ing Each of the 45 Points of the Grid Points I Marked Them With My Dremels Small Grinder.
Step 2: Widening the Circles; With the Pilot Holes Marked I Widened Out the Holes With the Ball Grinder. As This Was Done Late in an Apartment It Was Loud and I Rushed It.
cleaned it up and got rid of the markings