Clamshell Quilt

I'm in the process of making the "Glam Clam" clam shell quilt by Latifah Saffir, in the 12" block size. Piecing on my vintage Singer 301a.  Loving the pinless piecing that Saffir explains on her blog.  I'm making the queen sized version.  All of the piecing is done concave to convex, similar to setting in sleeves.  I think that all of this piecing curves is going to up my sleeve setting game!