Mark, That looks GREAT! You've done a fine job on the knot. Don't those colors just look great when combined? I'm sure I'm not the first to do a multi-colored knot, but thanks for the compliment. I did study quite a few pictures to figure out the proper sequence to cut them in order to give the illusion of them interweaving.
As to the question of accuracy, once I'm sure my filler pieces are EXACTLY the same as my saw kerf, I attach two stop blocks to the bed of my miter saw, sandwiching the blank tightly between them. I also draw several arrows on the blank to orient it to be cut in the same direction each time.....Also I touch it up on the sander each time I glue it back together....It's gotta be square to rest on the bed right!
Now I've got to go read George's tutorial....to see what I've repeated..lol
Oh BTW George, Thanks for writing it....you saved me a lot of one finger typing!