Here's the approach:
We banded it with 2x4's to give it some strength and a thicker profile. We'll add a layer of 2 inch foam to pad it up.
A quick squirt of spray adhesive bonds the foam to the headboard
Wrap the foam in quilt batting to give it softer edges
Helpful hint - use an electric stapler. It goes much faster!
And if the staples don't go in all the way - give them a tap with your hammer.
Layout your fabric on the headboard using upholstery pins (a very useful investment!!) This headboard only requires 3 seams, so it's simple sewing, but getting the layout right is a key step.
After sewing up the seams, press them open and pin the finished piece back on the headboard with the upholstery pins. Start stapling opposite sides to get even seams.
Finally, pad and cover the 2x4 legs for a more finished look. And here's the finished product!!