I use that method all of the time on my Linus quilts. I leave the whole bottom open and then turn it. I tuck those two pieces inside and then pin baste the whole thing. I quilt it by using a fancy stitch and variegated thread. I quilt about every 4 inches vertically across the width of the quilt. I then finish it by stitching about an inch away from the edge all the way around. That secures the bottom opening shut and creates a false binding. I never machine quilt anything larger than crib size as I am a hand quilter but I don't see why it wouldn't work.