So my players decided to jump ahead in the story line and foolishly attack a well guarded castle with 3 armies moving in and around it due to a large scale war. Their hope is to fly an airship they've acquired above the castle and drop a yet to be captured Dire Bear in the courtyard as a distraction while they enter from the roof. I wasn't expecting them to be at this castle for several months yet and had not even considered designing it yet. I have the lay out but still need to decide what is in each room.

I have 50 rooms to fill in this castle. and have no idea where to start. The royal family consists of 8 people each would have their own bedroom. a kitchen, servants quarters, throne room, war room, Banquet room, armory, and vault. So that leaves roughly 35 rooms that I have no idea what would be in them. Any other ideas would be most appreciated.