Have you tried strip piecing the blocks? Eleanor Burns has a strip-pieced log cabin quilt book, and it is so much easier and faster. You sew all of the 2" dark strips to 2" light strips, then cut them 2" each. Sew all of these to the next dark strip and cut apart, then sew on the light strip. It really goes much faster! And they are accurate, too.
I love your fabric choices!