I love my king size flannel quilt but it was really heavy to work on. I used the heavier flannels JoAnns sold a few years ago, countryside flannel I think it was called.
I found it easier to match seams by pressing them open and it reduced the bulk a lot. I also think strips smaller than 2-2.5 inches are about as small as I would go because you get so many pieces and seams it gets really heavy which was wonderful when we lived in Missouri but I don't use it as much down here in Florida!