Good, What ever you do, try to do a mock up with scrap fabric, like muslins, or cut it out on paper..Don't forget the seam allowances.
the finished D9P is 12 inch..or 12.5 unfinished.. the cut strips used to make the 9 patch were 4.5
if anyone has a math mind..you can check my numbers please..
i am one of those math people that thinks if she has checks, she has money! ROLFMAO!