I just started piecing some blocks using this same curved pattern. I don't have much experience with curved piecing, and wondered if I could do the seams properly without major effort.
Years ago I bought a Curve Master Presser Foot at a show, but I'd never used it. I remembered it, and pulled it out for this project. It turned out to be very easy to use, and works great! No pinning required, and the curves turn out beautiful. I'd recommend this foot, if you are thinking of finishing (or re-stitching) these blocks. Here is a link for it:
http://www.amazon.com/Curve-Master-CM008-Presser-Foot/dp/B002Y19J3W. It comes with adapters to fit different sewing machines; I think I might have had to buy a Bernina adapter separately? There are also several videos online for the foot.