I was interested to see she used the equivilent of 30 strips as the original jelly roll race calls for 40, but it seems her dimensions worked out just fine. I've done something similar but cut mine 3" as I was using whole width fabric. It was a bit dicey to get the right length but I was happy with the result using all B/W fabrics. I want to try this as a truly scrappy as I have a lot of short pieces 1/8-1/4th yard I don't really care for. I thought of using a blender/solid that would help tie the colours in every three of four strips. Hmm. Maybe this will be my next project.