Isn't there a machine like this that goes around to boat dealers and chews up old hulls? I had a marina tell me there was but he didn't use it because it was expensive. I was glad because he gave me the motor on the boat if I took the whole hull off his hands. I cut it up with a Sawzall with a fire and rescue blade into 4 foot chunks and threw them one at a time in a dumpster for 12 weeks or so.