Thank you all for the feedback about the SOG. It will be much more fun to arrange my segments in the most pleasing manner. I was intrigued, though, to see what would develop if I just let Ka decide...
The half hexagons are going together faster than I thought they would! Since I posted last night, I have 8 done. I have a total of 90 cut out, and some more fabric.
Afterthought: the square root of 90 is 9.48, so if these are 6" blocks it should make about a 54" square quilt.