Cut the plywood in half to get two equal size pieces.
Set aside one half and draw a grid on one side of the other half with each box in the grid 2 square inches.
Drill a 1/2-inch hole into each grid intersection.
Place the second plywood piece on top of the drilled plywood, line them up evenly and screw them together.
Cut the wooden dowels into 2 1/2-inch long pieces.
Cover one end of each dowel piece with wood glue and press them into the holes in the plywood.
Screw two straps or handles onto the side of the dibble board opposite from the dowels and space apart enough for you to comfortably pick up and maneuver the device.
Let your dibble board dry completely before using.