I really was impressed that the holes were not more severe. After repairing my boat I took a picture of the rock with the water lower. I TOOK a chip out of that damn rock! It was pointy and probably less than an inch under water at the time.
Unfortunately it was costly. Around $1,200! The weld shop cut the entire rear bench and removed the foam. May have spent too much, but I feel good knowing they did a good job.