I made this quilt also. I found that when sewing them together, & one side being a little off, all I had to do was pin, only at the seams, & at each ends. That will show you what part is a hair off. The side that is a touch longer put down & the touch shorter on the top as you sew. The feed dogs will take up the extra when sewing together. When doing this, you can also give it a little stretch as it will not affect the looks of the completed block. Hope this helps along with the other hints given you.