If it's a real DWR (and not a faux shortcut pattern), the pieces in the arcs are not straight strips. The sides are angled, which creates the curve.
You can't get the same effect cutting a curved piece from a strip set strata.
eta:
Is this it - a Judy Niemeyer pattern?
http://www.keepsakequilting.com/productdetail/5586.htm
Take a look at the foundation for the arcs - you'll see the shapes.
Judy's patterns are very well know, well produced and gorgeous.
You'll be surprised at how quickly it goes once you get going.