I've done a wall hanging with this block but I hand pieced. I made a template out of plastic, drew round and cut out all the blocks, eyeballing the seam allowance and marking the centre of the seams then pinned carefully, easing in the curves. I also made a doll quilt recently for the June swap using this block. On both, I did embroidery following the seam lines a bit like on crazy quilting, they are really fun to do and I love the effect of the curves. :D
Good luck! I'd like to try machine piecing this one day but haven't been brave enough to try curves by that method yet. :shock: :D