Cut a 10-inch-by-6-inch section out of the plywood. Cut two 10-inch sections out of the plank.
Paint the wood with the blackboard paint and let it dry. Paint a grayscale and primary color swatches on the side wooden planks that will face the camera and let them dry. Each swatch should be at least 1 inch in width.
Place the planks together and secure them to each other using the brass hinge. Glue the bottom of the plank to the plywood board with the color swatches facing out. You can use a nail gun or small screws to further secure the clapper to the board.
Use the small stencils to paint on the information headers on the board. A typical clapperboard will have the time stamp, the name of the movie, the roll or tape number, the scene number and the take number. You can add other pertinent information that may help such as the type of shot, the location and the camera number in use.