I wish I had some appleply or Baltic birch in the right size but I did not. but this let me try it out in cheaper plywood. I only mismeasured the center piece. not sure how I managed it but I did it. I had to cut it again and it was even worse plywood. but the mortises were perfect. I think good ply will look interesting with the 3d carving. I will post a finished picture tomorrow. I used 3/4" ply and the stool top is 12x8 I think and about 1' tall. the sides are also through tenons with a wedge.