We are now cutting the cubes using the medium/light angle strips.   As you lay them out notice the top green now angles off to the right.  This has to be correct to get the proper shape for your cube.

Once lined up correctly use the ruler again along the 4.5 inch line and your seam to cut the angles as you did on the dark strips.   NOTE:  Your ruler is upside down for this cut.  See photos below.  The hard part is done.  You’re now ready to lay out the cubes and move them around till you get the shading you like.