Sewing together the blocks

Since there is a large middle panel in this quilt what I did was sew together horizontal rows 1, 2, 3 and then 7, 8, 9. Then I vertically sewed together the columns (1 with 2 and 6 with 7) of rows 3, 4, 5. From there I attached the vertical columns to either side of the large skull panel block. Then I added the piece of rows 1, 2, and 3 on top and 7, 8, 9 to the bottom.