you had me really excited for a second when i thought you had found a current manufacturer. thanks so much for posting though, gold mine of illustrations to reverse engineer from! i have seen some of them in lynn miller's books, this must have been one of his sources...
beautiful stuff...git'er done without hydraulics! ( i think slings will be easier to improvise than the grapples..)
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It's like binging on 7 seasons of your favorite netflix permaculture show