The mckenzie river dory, or drift boat, is an adaptation of the open-water dory converted for use in rivers. a variant of the boat’s hull is called a modified. There are no finer or more complete drift boat plans available anywhere in the world today at any price. don hill helped design this drift boat cover. Explore kenneth bunce’s board "boat — drift / dory" on pinterest. | see more ideas about wood boats, boat building and boat plans..