Fiberglass hulls are reinforced with balsa wood. Transverse bulkheads were also compositely built-up with several species of timber, plywood, and balsa. The deck is a sandwich of balsa, fiberglass and polyester. Model buildings are commonly made from plastic, foam, balsa wood or paper. He also built model airplanes out of balsa wood. Base materials include paper, fabric, and lightweight balsa wood. The wingspan, aircraft was constructed from carbon fibre, balsa, and foam. He became fascinated by flight, and built model airplanes from balsa wood kits. The diablos dress in intricate masks carved from balsa wood. He ran a company building small, lightweight boats out of balsa wood. The shell sandwich skins comprised birch three-ply outers, with cores of Ecuadorean balsa. The aircraft with wingspan and mass of was constructed from carbon fibre, balsa, and foam. Even solid balsa surfboards are available. Flute board or Coroplast can be used in place of balsa wood. This was made of balsa, sandwiched between two thin sheets of aluminum.