This would definitely fall into the 1 day or less category if you have the whole day to work.
1. Tape some paper to your wall above the bed and draw out the shape of the headboard. It's a better idea to only draw one side, fold your paper in half and cut. This will ensure both sides match.
2. Lay the paper cutout on your plywood and trace the shape.
TIP - have the lumber store cut your plywood to the width and height you need. This will save you time and it means you only need to cut out the decorative shape.
Tip #2 - Check to see if your lumber store sells off cuts. These are the leftover pieces that were previously cut for someone else. I found a piece that was close in size to what I needed and it cost $13 compred to $40 for the entire sheet of plywood.3. Use a jig saw and cut along your pencil marks.
4. Lay your foam on the floor and then lay the plywood on top of that. Using a sharpie, trace around the plywood. Cut.
Tip - Foam at the fabric store can be pricey. I bought a roll of camping foam for $20. It comes in 1", 2", 3" and 4". I used the 2".5. Attach foam to plywood with spray adhesive.
6. Lay batting on the floor and then lay plywood on top and cut around the batting leaving enough extra to staple to the back.
7. Do the same thing with the fabric. If you're using a shape rather than a rectangle for the headboard there will be lots of stapling, adjusting and restapling. Be patient and don't be afraid to pull the staples out and readjust.
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