Douglas,
It is a king size headboard from Woodsmith #145. The hardest part was cutting the slots for all the splines. I built the posts first and cut the slots with a dado. When I started the arched top and rails I used a slotting cutter in the router table. Maneuvering the arched piece, which is 72" long, was tough. Mainly because of my shop size. Getting the slots the exact size as in the post was tedious. I was contemplating on changing the assembly method before I started to using mortise and tennon, but didn’t. It has worked out so far and I have been able to work around my limitations. The most difficult part assembly wise was gluing up and clamping the frame assembly. This was again due to size. Every time I had to use my table saw I had to move the frame. I will definitely be glad when this is in the bedroom.
Gary