Can we build one ...
Yes we can ...
A speed run that is

How about we get a 500m length of 400mm diameter poly-pipe and anchor it in place in a curve (modelled off the famous Sandy Point) at Dorans in the shallows. This pipe would act as a chop-killer and allow for full 10-second speed runs and even a 500m attempt.
Just need to get the pipe, anchor it at about 5 spots along it's length and there you go.
Can we source some second-hand pipe? Some anchors and chain? Can we get Council permission? Would we want this out there? Could we store it along the foreshore as you drive in to the carpark when not in use?