How did you know the size to cut it. I wanted to make Nancy Zieman's Dresden Holiday wall Quilt but it uses her Trace 'n quilt templates they sell for around $18.00 a little much to make one quilt, so I was thinking if I could figure out the dimentions of the blades I could have my DH cut one for me. I think that the blades are 14-1/4 long but how do you figure the top and bottom dimentions.