You did a marvelous job considering there was no interfacing. I have been to the too cool site and I have to disagree about the interfacing making the quilt stiff. I have made numerous T-shirt quilts and I ALWAYS do lightweight fusible interfacing and my T-Shirt quilts are NEVER stiff. They are soft and cuddly and MUCH less prone to stetching out of shape, puckering or pleating in the quilting process and I suspect they will hold up better over the long haul. My oldest one is over 10years old and haven't had any problems with it. The stiffness factor is entirely dependent on the interface. If you use a stiff heavy interfacing you will get a stiff heavy quilt. Use a lightweight one made especially for knits and all it does is keep the blocks from stretching out of shape and adds no stiffness. I am with you, I will not quilt a T-shirt quilt if interfacing wasn't used.