Jeff M., that approach works very well in the west, prairie sandy soils, etc. But really, it only stands to reason that construction technique must vary by climate, soil, and styling. I don't believe that Bunkerhill, Jeff and Rod, Gil, Jim and Geoff, or any of the C&C guys that aren't Bunkerhill cross overs will use the same technique in tight heavy soils in the northern clay-loam area that they would in the Sand Hills. It is great to have those native areas of interesting plants and consistency to rip up and stack, and seed the nooks and crannies. But it ain't going to work if you are doing some like Tommy just posted in Palm Springs by Schmidt and Curley, or working on Thomas's at Riviera.
I have to imagine that the more crucial matter is the core, floor shape to drain, and slope to lips to divert water. In a way, the edging seems like the artsy fartsy stuff you add at the end.