I've noticed that a lot of ocean vessels have right hand screws on the starboard and most river vessels have right handed screws on the port. Some companies will reverse the order declaring better manuverability. Also I've notice vessels with kort nozzles have the right hand screw on the port to where most vessels without korts have them on the starboard.
So really it's up to you, or you need to find a prototype vessel and observe how it's set up. With my experience with river vessels, nine times out of ten it's short words go together. port, left, clockwise and longer words go together Starboard, right, counter-clockwise.
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