Here's the link ....
http://www.wpt.org/sewingwithnancy/
For anyone who has done a OBW, she's doing it via the same technique of 1/2 hexes being joined for all straight line sewing and no Y seams. So each hex has one seam down the middle.
Kind of like the way Not Your Grandmothers Tumbling Blocks are done.
From the distance you get the full hex one piece look, though up close you see it has the seam.