I am working on one right now (my first)....since I am new to quilting and sometimes math challenged....I made all of my t shirt blocks the same size using a 15 inch square ruler (man sized t shirts XL). Bought Pellon fusible interfacing at Walmart and had no problems. If I can do it, anybody can do it. I am now working on my backing piece. I am putting a few smaller t shirt designs on the back in a few sections.....I might rethink that when I start quilting it all together. Hopefully I can post a picture when I get it done.