A question for which I have not ever been able to find an answer based on contemporary sources...... for the gun ports on the upper gun deck in the area of the waist where no lids were used, why wouldn't the hull planking cover the entire lower sill and frames to form the gunport like it does with the spirketting inboard? I have no idea if there was a rule on this, just curious if there was a consensus among ship builders in the age of sail. Looking at a couple models at Preble Hall, the planking comes up short like at the ports with lids (and which you have faithfully duplicated on your model). This is probably a question with no answer from those days and of little import but inquiring minds and all that.
I may have the answer to that, but first, an anecdote -
Some time ago, a group of animal behavior scientists decided to do an experiment. They took five rhesus monkeys and put them in a large cage. Inside the cage was a ramp leading up to the ceiling of the cage where a bunch of bananas was hung. Then the experiment began.
Every time a monkey started climbing the ramp to get a banana, the researchers would spray the other four monkeys with cold water, which they absolutely hated. Very quickly they learned to attack any monkey climbing the ramp so they wouldn't get sprayed. After a while, the researchers stopped spraying the monkeys, but the behavior persisted - no monkey could climb the ramp without getting attacked.
The researchers then substituted a new monkey for one of the veterans. Unaware of the "rule", it quickly headed up the ramp where it was promptly attacked. In no time, the new monkey learned the same behavior. One by one, each veteran monkey was replaced with a new one and each one rapidly learned the "rule".
Eventually, all five of the original monkeys had been replaced and none of the new ones had ever been sprayed with water, yet they still attacked anyone who started up the ramp. None of them knew the real reason why, but they did it
BECAUSE THAT'S THE WAY IT HAD ALWAYS BEEN DONE.
And that, my friend, just may be the answer to your query.

(Unfortunately, that also holds true for so many things in life.)