I know you're really good with the robotics software, so I'm just going to suggest an approach, and I know you can improve on it. I would try to emphasize the diagonal lines of this quilt. Use a fairly simple block design, but consider a "block" to be 4 of your quilt's blocks, and repeat that design diagonally so that each design overlaps the previous design. The attached is a simple version of what I mean - pardon the poor drawing.