Pirates of Barracuda Bay 21322 - Is there a way to get the ship pirating-worthy?
The review over at Brickset mentions this exact modification:




  Pearl gold windows are fixed inside each gunport, preventing the deployment of cannons. While this seems slightly odd, the lattices can be removed and replaced with cannons, as demonstrated here. I appreciate these options but some furniture must be removed from inside to create enough space for the weapons, corresponding with the officers' quarters on historic ships where cannons could replace tables and chairs during battle.


(Emphasis by me)