I am struggling with this block. Everything was going fine til I started setting the sections together. My corner section comes out a good 1/2' larger tha the triangle that connects to corner and center block. I have taken it apart and resewed it with the narrowest seam possible....it was still not matching corners with corner section. I rechecked to make sure the pieces were cut right . Haven't been able to figure out what I am missing. Thanks for any help.