This set up was needed to create a platform to repair the House on the Bridge in Ambleside. It is a hinged platform so we can apply moments. I estimate that it is 6m long. 8 x 20kg masses on the pavement. Two attachment points on the platform make the analysis more complicated and perhaps unsolvable so I'm going to assume that all of the load goes through the oblique cable at about 30 degrees to the platform. Worker at 3m from hinge, cable at 5m from hinge. Then moments
5W=3 x 160gcos60
W = 1300N
So it will support a worker but not much more because the weight of the platform is included.
