I slept on it, and I created a version that maintains the proportions of the Palestinian flag, 2:1 with the chevron covering one third of the width. I think this is closer to the original design. What annoys me though is that the rainbow stripes are now very close to being rhombi but not quite: One side of each rainbow color parallelogram is (30 total width - 4 red chevron portion)/5 remaining rainbow colors = 5.2, while the other side is 5.