Finally! This block was a little hard to describe, so let me know if there is any confusion.
Print or trace the diagram onto foundation paper, number, and cut out as in the photo.
Foundation piece all the numbered sections and trim their seam allowances to 1/4".
Also cut the center diamond out of main block fabric, leaving a 1/4" seam allowance.
Sew two matching pieced sections to opposite sides of the center diamond. Start and end you seams about 1/4" from the edge or, if you have your foundation paper still attached only to the end of the seam line.
(I forgot to take a photo here.)
Sew the other two pieced sections to the other two sides of the center triangle, once again starting and ending the seams at the seam lines.
Place a the diagonal corner seams right sides together and sew, starting at the block edge but ending the seam where the seam line ends (where the seams you sewed before meet up. Repeat for the other three corner seams.