RRoan, ok, that's fine, but I disagree with you...
So what are the things on the upside-down globes then? You even have what appear to be upside-down spotlight stations.
When the ship is sailing, and go on land in a way with legs, small circulair floating batteries will be mountained at the underside/belly of the ship to cover that part with gunfire. They can be removed but they are mountained upside down, I'll post the battery it self tomorrow.