Cut the 1-by-3-inch lumber to two different lengths. Cut eight boards to 4-foot lengths. Cut another eight boards to 3-foot lengths.
Cut the ends of your sawed boards so that they have 45-degree angles. Use a miter box for this. A miter box comes with a miter saw that will help make the cuts uniform. Make sure your angles run the same direction on each board. For example, if the top of the board slants up to the right, miter the lower end so that it slants down to the right.
Nail the mitered corners together. Nail 4-foot boards to 3-foot boards, making sure the corners meet smoothly and snugly. Drive finish nails in to secure the corners. Finish nails have small heads that will not show when you are done with construction. You should end up with four wooden frames that are 4-feet tall and 3-feet wide.
Paint your wooden frames with black semi-gloss paint, using a 3-inch paintbrush. Allow to dry overnight. Apply a second coat for complete coverage.
Hinge the wooden frames together. Place the hinges on the 4-foot boards, and screw them down with a screwdriver. You now have four hinged frames that make a single piece.
Place the hinged facade face down on the floor. Cut Lycra or Spandex sheets so that they are the same size as each frame. Staple them to the boards.
Stand your facade up, and look at it from the audience or front side. You will see black frames around stark white centers. This is your finished facade or front board that will hide your equipment.