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Cool, good point about the pulley force thing. I was also thinking of buttressing to the ground, the a frames of the long wall are already basically over hanging the edge of the Tarmac.
The thing about the pullies is how easy the net is to get down, I'm not sure people would bother if it's too hard...
@Khornight2 gave me an idea using rope and pegs for the prevailing wind direction, may cut costs, but need to look into feasibility.