I have recently done 3 or 4 with fleece backs. I tried it once years ago and gave up on it. The difference is that now, when I am pin basting, I am rolling my work around a board (1x4, sanded carefully my my DH, with slightly rounded edges). I work to make it smooth, rather than pulling taut, as I used to do. Because I don't stretch the fleece, everthing comes out right. I quilt with a walking foot, generally in the ditch and once between block edges. I start in each direction in the middle and work out. No more puckers.
I have also done the same method Quiltingaddict UK uses, using an asterisk stitch. That works nicely too.
That is a lovely example of crazy quilting.