Customs Fortress, Outpost - Interior

"...are you mad? This old heap of stones you're thinking about to raid is called The Porcupine for a good reason..." This fortress could be everything from a trading company outpost in the middle of the sea to a border fortification in a river delta to a custom house placed in the middle of a lake. It's not beautiful, it's old, it has wet walls and most likely very ill-tempered officers and personnel. Say hello to morning fog, midday rain and evening drizzle - well, at least most of the time.