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Put the box together by hand to see if the pieces line up. Apply the glue to every edge that touches a different edge. Drill wood screws into the edges of the rectangles to connect the pieces. Let the box sit for 2 hours before testing it. Spray paint your jump box to decorate it.
Take one of the 22.5 by 18.5in (57 by 47cm) rectangles and put it on the floor. This will be the base of your jump box. Then, put the 28 by 20in (71 by 51cm) pieces on opposite sides of the bottom rectangle with the 28in (71cm) sides going upwards and the 20in (51cm) sides on the part of the bottom rectangle that's 18.5 inches (47cm) long. Add the 28 by 22.5in (71 by 57cm) rectangles to the remaining sides of the bottom rectangle, with the 22.5in (57cm) side lined up with the 22.5in (57cm) edge of the bottom rectangle. If the wood doesn't line up, you'll have to go back and make cuts to change this. Apply Gorilla glue in a thick, even coat down the thin sides of the plywood. Work one piece at a time, then press the pieces together. Leave them to dry for 10-15 minutes before moving on to the next piece. Wipe off the excess glue that drips down the sides of the plywood as you wait. Place these wood screws about 5 inches (13cm) apart and drill them into all 4 sides of the top and bottom piece of plywood. Then, drill wood screws about 5 inches (13cm) apart along the left and right sides of the 28 by 22.5in (71 by 57cm) rectangles. The goal is to have screws connecting each piece of plywood to every piece of plywood that it's touching. Though the Gorilla glue dried during application, give your box a few hours to fully set. Then, once the box feels sturdy, gently step on it to test it out. If it holds, lightly jump on it to ensure the box is safe, and not wobbly. The beauty of having a 28 by 24 by 20in (71 by 61 by 51cm) jump box is that it gives you 3 separate heights with which to work. You can start with 20in (51cm) box jumps and work your way up to the bigger heights with time and practice. This is an optional step, but one that give your jump box a professional look. Coat the box with an even spray, using whichever color you'd like. Once you've painted each side of the jump box once, add a second coat to each side to give your box a polished finish. Work in the garage or outside your home and wear a respirator if you have one. If you're working in your garage, make sure you open the windows and garage doors to properly ventilate the area.