Gather materials: 2×4 lumber, 1/2-inch plywood, wood screws, wood glue, sandpaper, paint or stain, and cornhole bags
Cut four 2x4s for each frame: two at 48 inches and two at 21 inches
Cut two 2x4s for each leg: one pair at 11 1/2 inches and one pair at 12 inches
Cut 1/2-inch plywood to 24 inches by 48 inches for each board top
Mark a 6-inch diameter hole centered 9 inches from the top edge
Drill a starter hole and use a jigsaw or hole saw to cut the hole
Sand all cut edges and surfaces smooth
Assemble the rectangular frame with wood glue and screws
Attach the plywood top to the frame with screws
Build and attach folding legs to the underside of the frame
Round or bevel the front edge if desired
Fill screw holes with wood filler and sand again
Paint, stain, or seal the boards
Let the finish dry completely
Check board height and stability before use
Make a second identical board
Place the boards 27 feet apart for regulation play