And regarding the ‘shakiness’… not really. The bends are at different angles for each leg (as opposed to, say, all facing forward), thus making the collapse of the structure not possible.

I would only be worried about the lower end of each tube, which could be kicked inwards or outwards, but the tubes seem to have quite thick walls, so it should be no problem. In fact that’s the only problem I have with it, it might not be as material efficient as it looks.