The hull will have a copper coating, that is a better coat than normal gel coat, for preventing the magnetic fields of the water and instruments causing rapid regrowing and deteriorating problems like, Osmosis and corrosion under external fittings.
The inox shaft and propeller guards will then be fitted to support them on shore landings. Stones and sand could otherwise damaged the propellers, also the shafts could otherwise be buckled under the strain of a mis balanced shore landing.