Measure from top edge of baseboard to ceiling to determine headboard height. Add 12 inches to this measurement to determine length to cut fabric panels. Cut two equal lengths from fabric.
Stack fabric panels with right sides together and pin side seams, making sure to align pattern if using a printed fabric. Sew down entire edge of fabric on both sides, creating a long sleeve.
Using headboard dimensions, cut plywood and 1x4 boards to size. Position plywood to create headboard size then attach four 1x4 boards along plywood edges with screws to create outer frame.
Center fabric panel over batting and frame with at least four inches excess extending beyond all sides. Adjust fabric placement to ensure pattern is equal on left and right sides of frame.
Tuck fabric and batting firmly under headboard frame along all sides to hold in place. Secure fabric to headboard by hammering nail head trim through fabric into frame every six inches. As you hammer, make sure to keep fabric taut. To create a placement guide for the nail heads, draw a straight line with fabric marker. Continue adding nail heads until border around entire frame is created.
Pull excess fabric out from under frame. Apply fabric glue along top and side edges of wood frame. Press fabric firmly onto glue and tuck under frame. Allow to dry for at least one hour.
Flip frame over then trim off excess fabric and batting from edges and corners. Fold fabric over back of frame and securely staple.
Apply heavy-duty construction adhesive to back of headboard frame. Position headboard against wall and press in place. Firmly brace headboard against wall using two 2x4 boards and a sheet of plywood. Let glue set 48 hours before replacing bed.