You can clearly see the ship rig from the separate main and mizzen channels, rather far aft due to the clearance for the mortars in the waist. 10" Sea Service (90lb bomb to ~3.6km) forward, 13" Sea Service (205lb bomb to ~3.8km) aft.

The model does have three voids for the fore, main and mizzen, but the mizzen is rather fine and may have printed closed.

Of course in action she would be anchored under bare poles or furled topsails, courses cleared away. In company with the bomb tender, which would prepare the supply of unfilled bomb for firing with the powder charge and fuse cut to suit the range which was selected to suit the available combinations of propellant charge (also made to order on the tender) and fuse timings to burst the shell over the target (or alternatively immediately after striking the ground and buildings (to seek a bomb bursting in a magazine)). A buoy dropped at the firing position would be used to mark the battery position so if the bomb needed to move away it could return to fire with good effect from the outset on returning to post.