This isn't a video which particularly explains how to make a broken chair into a sledge, but if you had a one and in particular and garden chair, it is relatively easy to rescrew the parts together into a sledge. The only additional pieces are a strip of metal to reinforced the seat area, made by bending a the angle on a vice and also adding metal strips onto the rungs.
Basic photos of stages: https://www.facebook.com/photo.php?fbid=521490229463&l=68801a6714
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