Hi! I just finished a baby quilt were I used the backing and binding as one piece. I did more or less like the tutorial showed but slightly different. I cut my batting about 1-1/2" wider than the quilt. Then added the backing, cutting it about 2" wider than quilt and batting layer. I think when I folded the backing up and over to form the binding, there seemed to less bulk because it was the one layer 0f batting and backing fabric. Did a blanket stitch around the entire binding. I also didn't finish the corners like the tutorial, I hand-tacked mine.
I really liked how it all come out. There's picture of quilt in my photo album in the "my quilts" section. Chris