Agree with Jordan Fabrics tutorials - they were very helpful. I made one using 8 pieces and had trouble with the center of the block not being flat. I had success when I started stitching the pieces together 2x2 at a time if I started from the center about 1 thread deeper than 1/4” and tapered to edge about 1 thread less than 1/4”. I also had better luck pressing the seams open, which I typically never do.