Yep--paper piecing. When I read the pattern and it said "sew with a very scant 1/4" seam allowance" on only some of the units and then easing those units into the centers, paper piecing seemed like much less annoyance. And I have tons of scraps, so I am just using any shape and trimming later. Somehow it seems OK to trim off and throw away a piece of fabric when just tossing it would have seemed wasteful LOL.