I like your fabric combonations! It will make a great quilt. I had some trouble with this block too & I have to admit it is nice to hear I am not alone! I found that when I did my last seam that if I did it in 2 parts it came out better. I pinned then sewed from the edge through the middle, then pinned the other half & sewed from the middle to the other edge. Seemed like no matter how much I pinned the thing I couldn't get it to come out right until I started sewing it in 2 parts.