Nubian
It makes didley squat difference the redesign of the pad if a pilot decides to land too close too something. The locations of the pads are obviously a factor, where people had put the other machine was a factor, as was the rain. The root cause was the pilot. If the root cause was the size of the facility then they would have had accidents every time. I would agree that no risk assessment was obviously done when the pads were designed.
Lets be frank the pilot assumed that everything was ok, obviously not. although why the pilot's would accept a 2 ft clearance on such a facility is unbelievable. I think the expression what could possibly go wrong comes to mind, oh yes it did