I've spent a while building a detailed castle-like structure. The problem is, i have only plans for the first (theater/restaurant), fifth and sixth (residential) floor, while the other 3 are totally empty. The floors are 80x80x11, and because of the staircase it comes down to 80x60x11 open area (in blocks). So, I'm very open for suggestions and ideas.
Here are screenshots of the current progress:
Front view by night
Front view by day
Entrance sealed off with lava
Entrance open for guests
Levers for the lava pool and the waterfalls
Entrance of the castle
Entrance to the theater/restaurant, with receptionists
View of the entrance, restaurant, and most importantly, the VIP boxes
Actors performing on stage
Beautiful lighting arrangements
Spiral staircase to the roof
The roof itself
Spiral staircases to the tower top
Another view of the castle
Beautiful sunrise, with the fountains shown in the foreground
Arrow firing practice range (as suggested in the replies)
Last time I attempted a castle I tried (and in some cases failed at) Armory, Blacksmith, Throneroom, Enchanting / Library area, Dungeons, Secret Treasure rooms / Hidden Passages / Escape routes, Kitchen, Giant Hearths/Fireplace, Carpeting, Sleeping quarters/barracks. But I think after a while I got tired of trying to find excuses for rooms just so I could keep building upwards.
That was the more European style castle, when I tried a more oriental design of castle I said heck with it and put all the details on the outside and just made it empty on the inside.
The exterior will get a lot of more work on it (i will add parts to the left and right, so it looks like a giant mansion, as intended). Of course, that will lead to even more rooms to fill with various content.
As for the moment, I'm working on making the working floor (which means a library, enchanting and brewing area, workshop)