I agree, I use a lightweight fusible interfacing on all shirts. I had the local glass shop cut me templates in plexiglass for easier cutting. I have a 5x7, 7x9, 9x 15, and a 12x 18 I think. I can use 1 set of sides for the width and change templates if I need longer or shorter blocks. Seems to work for me. I just finished a queen size a few weeks ago. I did not use sashing between the vertical rows on this one as that is what the customer wanted but usually I frame some and leave some plain, just make my rows all the same width or height ,depending on how I am setting it together.