You do realize that you won't be able to create a finished block of 10" as is produced in the instructions. You should be able to get an 8.25" finished block using your charm pack. I would certainly try making a test block You are dealing with two problems, a pieced block set on point and half square triangles. I drew this on EQ7 and came out with the dimensions of your center strips should be 2 7/16" x 6 5/16". Try cutting your strips at 2.5" and 6.25" and see if that work. It is geometry that makes things difficult. Good Luck.