:........... Interesting as I would not have guessed #3. I have seen the #3 rarely on some models and it is now kind of funny that I thought they were doing it Wrong...........
I guess these modelers want to show their hinges, but not thinking about how it would be in reality.......but I am not so 100% sure any more.
After some research in the web and in my books, I think it is somehow between 2 and 3.
Important I guess was also the height of the deck by itself and the possible geometry of the tackles for opening and closing the lids.
Take a look at this photo, which is an excerpt from Jean Boudriot´s book about the 74 gun ship
If you take a look at this situation it will be clear, that it was important, on which height were
1) the hinge of the lid where is the turning and fixed point
2) in which height were the holes (do not know the correct term) where the tackle for the lid is going through the hull planking
and
3) in which height is in the different times (closed, half open and open lid) are the ring bolts for the lid-tackles.
In addition it was surely important, that at every situation and angle of the ship in wind, the listing, the lids could be closed only with leaving free the tackles.......
see herefore the wiki page under tactics:
https://en.wikipedia.org/wiki/Gun_port
some more photos out of Lavery, Goodwin and Boudriot / Delacroix 64 gun ship Le Fleuron
When you take a look at the HMS Victory´s lids they are shown now more or less horizontal, maybe because of the tackles......but we have to check the drawings of the Victory
Maybe you have the possibility to check all these data on your vessel?
I saw also historical Navy board models, where the angle are different on the same deck level......maybe this could be because of the different geometry of the deck hights.......I am sure you can find some examples in my book reviews from Lavery and Gardiner (click on title)
The Sailing Frigate: A History in Ship Models
The Ship of the Line: A History in Ship Models
Wooden Warship Construction: A History in Ship Models