How many new build coasters get erected and then painted? None as far as I know!? These are the final colours of the ride, unless Mack and Paultons are breaking with rollercoaster construction tradition! With a water coaster, there is a lot more steel involved, so I think they went for a lighter colour support so as not to overwhelm the ride with too much metal on view. The grey will blend into the scenery and terrain much better imo, just leaving the track on view. Maybe best to wait until its complete to reserve final judgment, but I think this is going to pleasantly surprise many initial doubters.