I did that tut and did not square up blocks I just sewed them on a 2.5" sashing and of course didn't measure that either. so after having it in the closet for over a year I got it out last week and took it to my club everyone said pretty but need to take it apart and square up.... I've taken off all the sashing strips and borders now waiting to recoup from reverse sewing then maybe start again. Did you use her measurements? And if so what did you square your blocks up to be? I'm such a novice... Thanks and I love how yours turned out!