Measure four lengths of 2-by-4 boards to 6 feet, and make a cut mark with a pencil. Cut the boards to this length with a circular saw.
Cut a 45-degree angle onto both ends of two 2-by-4 boards with a Miter saw. One end will be flush to the bed and the other flush with the floor.
Cut six 2-foot sections from another 2-by-4 board with the circular saw. These are the cross beams for the slide.
Measure the two six-foot lengths of 2-by-4, and make a mark every 12 inches. Place the two lengths of 2-by-4 parallel on the ground.
Place a 2-foot piece of 2-by-4 flat on the ground on each mark, along the length of the 2-by-4 boards.
Drill two pilot holes into each of the boards by using the power drill. Insert a screw into the pilot holes and drive them into the boards.
Place the metal sheet on the crossbeams of the slide. Position the metal so there is a 3-inch overhang on each end. Bend the 3-inch end of the metal to 90 degrees.
Secure the bent end of the metal to the crossbeam on each end of the slide with screws. Set the slide up against the bed to test the fit.