Part #3 involved making half-chevrons, and stitching the bonus triangle in such a way to get a 2" square. This left a very small seam, a bit over 1/8" wide! Bonnie wrote that it's sufficient, though, and she lugs her quilts all over and they seem to stay together!
Part #4 are 96 of these little strip-pieced rectangles. I used gold instead of Bonnie's orange. I got to use up tiny scraps with these cuties!
Here are all my parts put together randomly, just to see how they play together. So far, I like it!