Measure from the top edge of the baseboard to the ceiling to determine the height of the headboard. Add 12 inches to this measurement to determine the length for cutting fabric panels. Cut two equal lengths of fabric.
Stack the fabric panels right sides together and pin the side seams together, making sure to line up the pattern if using printed fabric. Sew the entire edge of the fabric on both sides, creating a long sleeve.
Measure and mark the center of a length of fabric, then cut, creating two side panels. Open iron seams on the back of the fabric.
Using the dimensions of the headboard, cut plywood boards and 1x4s to size. Lay out the plywood to create the size of the headboard, and then attach four 1x4s along the edges of the plywood with screws to create the outside frame.
Cut out four foam sheets to fit snugly against the headboard frame.
Spread two layers of batting over foam and frame leaving at least two inches of excess on all sides.
Center the fabric panel over the batting and frame with at least four inches of excess extending beyond all sides. Adjust the placement of the fabric to ensure the pattern is the same on the left and right sides of the frame.
Tuck the fabric and batting firmly under the headboard frame along all sides to keep it in place. Secure the fabric to the headboard by hammering the edge of the nail head through the fabric into the frame every six inches. As you hammer, make sure to keep the fabric taut. To create a placement guide for the nail heads, draw a straight line with a fabric marker. Continue adding nail heads until a border is created around the entire frame.
Remove excess fabric from under the frame. Apply fabric glue along the top and side edges of the wood frame. Press the fabric firmly onto the glue and tuck under the frame. Let dry for at least an hour.
Fold under the excess fabric at each corner to create a clean corner. Trim hammer nail head along top of fold to secure.
Staple the fabric to the top and bottom edges of the header. Note:Do not staple the side edges which will be visible after installation.
Flip the frame over, then trim off the excess fabric and fluff up the edges and corners. Fold the fabric over the back of the frame and staple securely.
Apply heavy-duty construction adhesive to the back of the headboard frame. Place the headboard against the wall and press into place. Firmly support the headboard against the wall using two 2x4s and a sheet of plywood. Let the glue settle 48 hours before changing the bed.