I have mixed feelings about that weathering. Sorry, just my 2 cents. If it is true that a ship was no pristine thing, my experience with weathering plastic airplanes tells me that it is very easily overdone. I would not weather my model in such a big extent, but of course it is a matter of taste.
As for the guns, well they were the ship tools and its reason to exist, as far as I know they were given much attention by its crew and should be mantained in perfect and pristine conditions.
If I were the captain of a ship where the crew had the guns in that state, I'd have them whipped as an example.
Of course this is my personal view, I recognize all the valid work that shelk had, giving the ship that weathered aspect.
For my taste it is a little overdone and the guns shoud be clean.
But anyone has the right of making his work the way he wants and if he is happy with that, it is ok for me. In the end a happy modeller is a happy man and that's what matters.
Best regards
JL