call that clever? i once had to push a very heavy control panel along a walkway at a sports arena in amsterdam. it was 35 metres above the arena, no one knew the loading limit of the walkway, but it was assumed it should be strong enough to take the weight of 2 fat blokes. luckily i am thin and the controller was about 150 kgs. so we worked out that if i didn't jump up and down too much it might be alright. i am still here so it was alright.
watching that video gave me the same sensation. wished i hadn't watched it before breakfast though. i would feel sorry for anybody underneath if he did fall.