I took my Epic V8 into Derwent Marine to get repaired today.
Don there doesn't think I did too much damage, but it's still going to cost me around $250 to get it repaired, plus I have no ski for a week :(.
I had been warned about the potential of hitting a submerged log and driving my rudder up into the hull during the Murray, and I even purchased and started to fit the attached hobie rudder to the back of my ski as a temporary retractable rudder specifically for the race.
Thing is I didn't finish it because I'm easily distracted, intimidated by practical matters and thought it would cost too much.
The funny thing is that it had cost me all of $28 to purchase the hobie rudder and probably would have cost me another $50 or so to buy the rest of the stuff I needed, and a few hours to fit it.
Oh well, live and learn.