I have made two t shirt quilts and learned the hard way.... First one, I used the fusible stabilizer, Cost a lot and lots of work and made the quilt really heavy. Second one, I starched the daylights out of the shirts, then cut them.... Worked much better. I machine quilted just horizontal and vertical lines, about 4 inches apart. I did find that it was way easier when I had to adjust the fabric if I was off. Here is a pic
Ellen