I finished the side and corner setting triangles, laid the blocks out on the bed, and started sewing them together. I foolishly thought they would be easy to put together, but I find that I have to press the seams open because of the bulk where the blocks come together. What a pain, especially on something large like this.
After two hours, I happily sewed two rows together, put them on the wall to admire, and you see the result. Grrr. Time to rip. Fortunately, it's trivial. Carry on.