Pic 17: I couldn't resist cutting out the cannon ports early. Note how the secondary planking curves up under the transom - take time to get this symmetrical, because it will show.
You can see how some of the cannon ports coincide with the formers inside. This may seem odd, but it's an unwelcome feature of this model. It will prevent you fitting the cannons later, so you must chop, chip or drill your way through to the cannon support within. I used a dental burr for this.