Didn't know what to do with the center open square. I didn't want to use plywood, so I used 1x3 slats for a Mission style bed look.
I am not a fan of the unfinished, raw look of the two boards meeting on the sides of the headboard in this plan. So I filled with wood putty and sanded (a lot).
This headboard is very top heavy. I wish I would have tried using 1X4's instead of the 2X4's like I read someone else did.