The back view, the grey colour, and what appear to be depth charges say some sort of patrol boat to me. Some of the markings on the deck look like the re might have been armaments sited there. So not a cabin cruiser, but no reason why it should not become one.
Rudders often come with a tube and arm, fixing is usually fairly self evident when the hardware is to hand. Measure how deep the prop reaches below the bottom of the hull. The rudder doesn't need to go deeper.