Mr Thorn removed the top structure last weekend and plans to remove the engine and rudders after the boat is taken out of Oamaru Harbour.
Highland Lass, once used for moving stock and transporting deer hunters, would be the fourth boat removed from the harbour this year, Otago Regional Council harbourmaster Geraint Bermingham said. It would be the second boat identified as unseaworthy to be removed this month.
No other boats needing to be removed from the harbour have been identified.