2 (36- by 48-inch) corrugated display boards
Heavy-duty double-sided carpet tape
24- by 36-inch zinc-coated metal sheet (we found ours in Home Depot’s duct section)
Multipurpose plastic ties and adhesive mounting bases (try Home Depot’s electrical supply section)
Base Layer With one display board facedown, apply masking tape along the two prescored fold lines to keep the flaps stable. Apply double-sided carpet tape to the board and the metal sheet, as shown (you may want to wear gloves to handle the metal), then remove the tape backing. Center the metal sheet atop the presentation board (we traced lines beforehand to make this easier), then cover its edges with more double-sided tape.
To make the bond very secure, go over the sheet and the taped edges with the rolling pin, using firm pressure. Set the base layer aside.
Frame Lay the other display board facedown and apply masking tape along the two prescored fold lines. Draw a rectangle with sides 7 1/2 inches in from each of the edges. On a protected work surface, use a craft knife to cut out the rectangle to create a frame.
Apply double-sided tape to the frame, especially along all the edges. Remove the tape backing, and with the frame faceup, align one edge with the base layer and lower it, as shown at left. Use the rolling pin to press the sections together.
Attach the cardboard headboard to the posts of your child’s existing one using the plastic ties and adhesive mounting bases. Secure it in at least four places. If your child’s bed doesn’t have a headboard, you can hang your creation on the wall with screws or nails.