Modern Outdoor Chair with Backrest

Per request of my wife, I opted to add a backrest to the chair. I feel as though my backrest design keeps with the style of the original build. I accomplished this by cutting the 2x4 vertical arms of the backrest at 13 inches with a 10 deg miter cut at the base. This allows you to keep with the 3/4" on the 2x6 backrest slats. I finished it off with a 2x4 top plate. I'd also note that I made slight modifications to the plans to accommodate 24" cushions.