Disclosed is a mass plywood panel assembly including at least two engineered wood panel assemblies. Each wood panel assembly includes a first layer including a first set of billets, a second layer including a second set of billets and a third layer including a third set of billets of sheets. The first set of billets, the second set of billets, and the third set of billets are all oriented longitudinally along the length of the wood panel assembly and the at least two engineered wood panel assemblies are connected by an end joint, thereby forming the mass plywood panel assembly. Methods of manufacturing mass plywood panel assemblies are also disclosed.