Triple framed pinwheel tutorial

With four more days to go before my Moda Bake Shop debut and giveaway, I need to distract myself with a bee block tutorial.  So I will show you how I made this triple framed pinwheel block for Amy Allie Kat Mom in this month's Fresh Modern Bee.  The finished block is 12" square or 16" square with the two rounds of sashing.

CUTTING:
1. Cut two 7" and two 4" squares of background fabric and cut each square in half diagonally.
2. Cut six 3" squares of triangle filler fabric and cut each square in half diagonally.
3. Cut several 3/4" strips of triangle border fabric as needed.  I used the equivalent of about four WOF strips.

1. Border each of the 12 filler triangles with the triangle border fabric to give 12 triangles looking like this:

2. Trim the small background triangles to the same size as the bordered triangles (very slight trimming required).  Join sets of three bordered triangles to the small background triangles in the order shown in the first three pics below.  Trim the large background triangles to the same size as the triple bordered triangles (very slight trimming required) and join the large background triangles to the triple triangles to give the block shown in the fourth pic below):

3. Join the four squares together, first in pairs and then into one block.  You now have a 12 1/2" block (12" finished).  If desired, add two rounds of 1" sashing (strips cut 1 1/2" wide) to made a 16 1/2" block (16" finished).

If I have shortcut or abbreviated these instructions too much, please leave any questions in the comments box and I will get back to you with clarification.  And, if you make this block, please credit your image back to this tutorial and show me what you have made.  As old as I am (although I did have copper highlights added into my hair yesterday and my nine year old said it took years off me), I still get excited when someone makes something I've designed.