This one was a bit of a headscratcher.
Print or trace the block diagram onto foundation paper, number, and cut out as in the photo.
I'm not a fan of inset seams but, because the angles on these are so shallow, it actually wasn't too hard.
Iron the seam allowances on the center square to the back and baste in place.
Place the block over the top of the background fabric square, baste, and applique in place.
Remove the basting stitches.