Model kit made of laser-cut poplar and birch plywood, with a walnut veneer hull. Requires PVA glue and careful assembly, but results in a solid and working machine. Inspired by an original drawing by Leonardo da Vinci (Codex Atlanticus, folio 945r), the model recreates a paddle-powered boat driven by a crank. Some mechanisms were simplified to adapt to the scale, but the function remains faithful to Leonardo’s concept. Valued in museum bookshops for its educational and historical appeal.