That's a pretty pattern, I like it.
Since the pattern calls for 1 1/2" strips, I'm not sure that a jelly roll would be your best best. You will be tossing 1" off each strip, unless you save for another project.
If you do use a jelly roll, I am sure it would take 2 or 3 to make this pattern. Unless you use 2 1/2" strips instead.