I've done it in a previous Hamilton 151,but would have no hesitation in doing it in my current 3.6m.But yeah just like the Clarence you'll show some battle scars .I,d be keen to run it again if u need a second boat.The dog leg run across the Lake gave me the shits more than the grade 3 river run.Shipping beam on greenies from chopped up Nor West.The rule of thumb is to get across the Lake early in the morning before the breeze gets up,and run both bilges assuming you have two plumbed up.The river run is an adrenaline rush,lock to lock,with very little heads up.The most exilerating 1 1/4 hr down run of any river I've boated leaving me mentally exhausted as a solo first timer boating it.Recommended for more advanced skill set.from memory she drops 600 feet from the outlet to the mouth.Its a blast!!
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