All that needs is a fairy on the top (joke)
IMO, theres too much weight, too high up on too small a footprint...I'd be concerned with the continual leverage this arrangement will transmit to the mounting points on the hoop top surface. Scale wise, those vertical tubes look more like 3" dia, but I'd go for 4" dia low down and try to spread the feet out wider. You may get quite a bit of vibration through this arrangement too, resulting in a pronounced wobbling of the very top end. It just looks very tall and skinny for the weight its carrying.