DogHouseMom is correct. I have done many bargello. First, I took drafting and your angle is not consistent in your drawing. What is your angle?? On row B there are 8 lengths then in Row D it is 5.5 but there was only 2 with your width between the blocks. I would keep it simple. Use a 45 degree angle. I would cut your strips and then I would snowball the corners. Then you are working with straight of grain. Then connect the strips together to form your design. Sew them into a tube. Cut your first one measuring 8.25" Include the side seam allowance) from the left side. Make the next one the finished width and use that as your mark. Don't forget your seam allowance. Once you got your measurement, everything should go correctly. Hope this helps. Good Luck !!