Castle Bojmir

I felt like building a big castle, so thats what I'm doin. so far its about 250x250 or so and im gonna add a whole bunch of things as I go. Multiple levels, secret rooms, if i can figure out how to make a redstone catapult or cannon, traps, dungeons, puzzles, challenges and whatever else I can think of and do. any ideas or advice on what should go into a sweet castle let me know!

I'm going to upload a world save when im around 50% for the simple reason that I need some feedback on what people think. I'm going to try to put a storyline or something like that to the map and that is barely started. Something along the lines of closing hellgates (very common in adventure maps I know) and solving a couple smaller mysteries around the castle and its immediate surroundings. The castle part itself is nearly done (65% or so) not sure what else I should put in but I know feel like i'm missing things so please download and let me know what you think, good or bad both appreciated.