The thing is it is not just a quick stitch of fabric to fabric, what it is actually is a quality control exercise.
I have had to realign some of the squares on new paper so as to get the squares nicely in place. I then stitch on the white fabric and depending on where the block is going to ( the edge or the middle) I cut out a new piece of paper according to the stripes I need. This then ensures that all of the blocks are the same size.
Have a good one.