Its sailing-in-the-sky, the ultimate job-of-the-future.
No, line strain is not a serious problem, just the glorious job of a SpiderMill sail-trimmer to occasionally adjust whatever. Nylon is still a go-to fiber for springy action, returning gust energy. Sails will also auto depower. Sailing is a mature art.
Yes, the lower layer is the control layer, or rather, upper and lower differential offset control the bulk. There is no excess wear if the bit of line at a pulley is heavier.
Here you see passive dynamic stability. The kite oscillates powerfully while staying up without a pilot kite. It’s the simplest cheapest sort of wing. Simply trim a drogue flat for it to become hot and dart about.
Rod, I can hardly post anything here under your posting restrictions and will soon be banned again by Windy Skies. So many photos, videos, and texts of the last two years experiments. Contact me directly to see and read more.