Would a ship made out of a single piece of wood have any advantages over a normal vessel?
Context: A particularly clever/mad mage has discovered how to make a living ship by binding a dryad into a particular shape instead of an ordinary tree. Such a vessel is self repairing, and capable of directing it's own actions to a certain extent, though it has to follow orders from it's Captain.
I am basically wondering if a hull made from a single piece of wood would be practical for a sailing vessel, or if the traditional ribbed/plank design is important for flexibility. In way the ship would be similar to a giant dugout canoe, except grown into shape rather than carved.
A lesser question would be about the practically of a hull that would be essentially green wood, rather than timber that has been dried and seasoned.