Really like this block and think it will work for something I'm working on--donations for a Relay for Life benefit. I think I'be figured out the measurement of the cut size for center background of the outer star but thought I'd check with you before I cut. Should those pieces be cut 3 X 3.5 or are they cut 3 X 3. To get square it seems like they should be 3 inch squares but marked to finish 2.5 X 3.