Having a backyard pool is fun and convenient, but you probably don't want swimmers bringing their wet clothes into the house. Instead, give your swimmers a private place to change their clothes: an outdoor privacy screen.
Build a rectangle with two of the pieces of 8 ft., 6 in. 1-by-3 and two pieces of 3 ft. 10 1/2 in. 1-by-3. The smaller pieces are the top and bottom of the rectangle and will fit between the longer pieces. The top piece will be even with the top edges and the bottom piece will be offset 6 in. from the bottom edge of the sides. Square all corners and screw the frame together. This should form a rectangle which is 8 ft. high by 4 ft. long. Repeat for all the pieces of 1-by-3 to form three rectangles.
Place a piece of luan over one side of one frame. Make sure it fits perfectly and is square. Nail the piece of luan to the frame with the finishing nails. Repeat for the other side of the frame and for the other three frames.
Attach three hinges to one side of one frame. The hinges should be about 1 ft. from the top and the bottom and a third should be in the center.
Attach a frame to the hinges. This is the middle frame for your triple folding screen. You should now have two frames connected that can fold together.
Attach the other three hinges in the same manner as the first three hinges to the opposite side of the middle frame. These hinges should swing in the opposite direction of the first three hinges.
Connect the final frame to the second set of hinges. You should now have a free standing screen with panels that fold in opposite directions toward the center.
Stain the wooden screen to protect it from the elements.