This design (plan) is an aluminum double ended mckenzie river drift boat. available in a low side and high side option.. The boat sides are made from 2 sheets of aluminum seamed together. this will make a boat roughly 15′ long. the 1st pic is of my welds. at that time i was unaware that. (photo at left: gayle and ken discussing his history in boat design.) after ken hankinson’s sudden retirement from the plan business in 2005, many were left.