Abstract: Methods for manufacturing composite material structures having one or more separable or replaceable skin portions. In one embodiment, the methods may include positioning first and second material pieces adjacent each other within a mold cavity and with a separating film disposed therebetween, introducing a first resin into the mold cavity to contact and substantially impregnate the first material piece with the first resin, and allowing the first resin to cure within the mold cavity to form a first part of the composite structure; and in which the separating film is substantially impermeable to the first resin.