I am doing this quilt using EPP, as well. I have 1 1/2 inch 60 degree diamond mylar patis, and have divided the longer parallelogram into 2 diamonds. I cut larger diamonds with 3" sides for the spacers from shirt boxes. My quilt will be sized differently, but I didn't want to purchase larger patis, or work entirely with paper and cardboard. I love having an 'on the go' project for in the car, and for sitting in front of the tv at night.