FYI, H. luzonensis reached Luzon in the philippines by ~700kya, and that requires blue water capable boats. Much more accomplished swimmers than people didn't reach the Philippines, like elephants and hippos. H. luzonensis had a brain little larger than Chimpanzees, but they had to have had open ocean watercraft to get to Luzon and they had to have them almost 1mya.
Complex construction with wood has been far more advanced for far longer than we have had evidence for, because wood, like almost all organic matter, rots in a matter of years, rather than centuries. On the Zambian border there is a site that is constantly wet from a waterfall, saturating the sand and preventing wood from rotting. There has been found the remains of a timber frame structure that has been confidently dated to ~478kya - prior to most estimates of the origin of H. sapiens. Both in Luzon and in Zambia pre-sapiens hominins have been shown to have had advanced wood working capabilities.
It is my belief that people have had boats before there were people. At least people like us.
Thanks!