Isnt the snugpak underblanket the oval shaped one? The clews theory should work, but make sure you leave enough length on each shock cord nettle to ensure that the entire clew ends up at a central, singular point. My nettles all started out at like 20", but yours should like 'cascade' on length to the edges (shortest in center, longer at each consecutive out from center. Like 7 nettles, center one at 17" finished length, one left and rightout from center at 19" one left and right out from those at 21" and so on)
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