For the one and only top your MIL every made, it was a lot of work, and she did a very decent job. And if it is 30 years old, they sure didn't have all the lovely rulers and cutting tools we have. If there are areas that are seriously out of whack, I would measure the block. Maybe a small adjustment in the seam would help. As to the quilting--quilt it with love--that's all that really matters in the end.