It is my understanding that the bow and stern chase ports were only armed with the adjacent broadside cannons, and only as needed. The matter is confused by the fact that even the best marine artists almost always show these ports armed.
At the time of the refit, I believe that the lower deck battery was reduced from 16 piercings to 15, with 14 ports armed. This allowed for better and more efficient operation of the guns, while opening the door to the experiment with the massive 42lb guns. After 1692, the vestigial “hunting port” disappears altogether, which is one characteristic of the 2nd Marine that is displayed on Tanneron’s model.
104 Guns should be correct for Barfleur. I question Lemineur’s assertion of 8 forecastle guns, though. I suppose there could be two forward-facing guns on the forecastle deck, itself, but I go back to the practical argument for needing working and recoil space between adjacent guns.
The ship does look lovely in the garden, though!