Step #3 took a bit more time than probably it should have. The interruption of lunch took away about an hour... And the double-sewing of the corner-to-corner 2.5" squares ate up some additional time as well.
As with most quilters, I try to save time by keeping the initial chain together and simply refeed them into the machine for the double-sew stitch.
So, three hours after completing step #2, step #3 is now complete. I haven't pressed the 140 bonus triangles, but you can bet they'll show up in a pieced border.
UPDATE 20 minutes later
Okay....step #4 was SUPER FAST! Whew! Gotta love those easy ones.