I made the block using the interfacing technique. This is a photo of the squares pressed onto the interfacing before sewing.
I was very pleased with the finished block. It is important to slit the interfacing along the stitched seams and press the seams open to get a nice flat block.
I am also amazed at how neat the back of the block looks. I will definitely be using this block in my next project. Its now back to the cutting board for the rest of the blocks I need..