Hey Izy- what I do with the foundation is make it into squares that work easy for me (I am a lazy quilter) :) So on my block of 16 inch interfacing (I said 20 inch earlier, which is for my 5 inch blocks)... so anyway, on the 16 inches of fusible interfacing, bumpy side up... I form my 'frame' of 2 inch borders and then fill in the center with 9 - four inch x four inch blocks. Then iron them all onto the interfacing... sew all the intersections together- if you notice bumps then you can cut slits in the back seams to help them lay flat. To join the blocks together, I just match the seams together and sew them up.... very fast and easy... If you want a hands on of my rambling, let me know and I'll throw one in your box. Trust me, you will love doing this. :):):)