Pad the headboard with 2”-thick firm density foam. Since the headboard is larger than a typical slab of foam, use foam and fabric spray adhesive to glue multiple pieces of foam together. Draw the diamond grid again on the foam. Use a hole-saw drill bit to remove the foam over every hole. From the buttons on the outer edges, draw lines straight out to the edges of the foam. In the curved section between the headboard and wings, it may be necessary to reduce the spacing of the buttons since ...