OK, this is what I come up with. PLEASE make a test square!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Focus Squares: 4.5" X 4.5", finish at 4"
Shadow: cut 1 1/2, finish at 1"
Background cut at 2 1/4", finish at 1 3/4"
From your background fabric, cut:
48 squares 1-1/2" x 1-1/2" (filler shadow: finish 1")
5 squares 2-1/4" x 2-1/4" (finish 1.75")
28 strips 2-1/4" x 5.5" (Length of your finish focus squares + finish shadow + seam allowance)
30 strips 2-1/4" x 7.25" (length of 28 strips, plus finish background)
From your shadow fabric, cut:
24 strips 1-1/2" x 3.5" (length of your focus squares, minus the finished size of the 48 filler squares from above)
24 strips 1-1/2" x 4.5" (length of your focus squares)