Step 3: Ooh, power tools!
The first thing you need to do is take a guide and set it two inches from the blade of the band saw. Make sure that the guide is straight and not off at an angle otherwise your strips will come out thick at one end, and thin at the other. You don't want this happening because you will have to draw new ones on a new piece of board and no one wants to have to do that twice.
Next, cut the grooves out that you had drawn before. Cut out the 3/16 inch wide lines down to the one inch mark that you drew in the last part of the second step. Use a box cutter or razor to cut the bottom of the tab out. Once you are finished, you should have a stack of 18 evenly cut strips, each with nine evenly spaced grooves.
Now it is time to put the grid together. Slide the strips you just cut into the grooves with 9 strips horizontal, and 9 vertical.