Subs will have more weathering than you might think even though they are always taking a bath.
Saltwater, sun, waves are all very corrosive. Boats and ships would return with their hulls chipped dented and rusted and the deck paint would be worn down to the wood.
I think you did a great job, especially on such an old kit. I would love to see you build some of your other ship kits. Ships are difficult and time consuming but oh so worth it once they are done.
By the way, I didn’t even notice the anchor was in the wrong place until you said something.