Here's some castle photos! I made sure everything was placed on the grid. You'd want a better water pattern, but that's what I had. I think it gets the point across anyway. In my mind you'd have a path running on the other side of the bushes horizontally.
I went for a princess-y room but if you used the gorgeous set and a few minor changes to the refurbishing you can make it more king/knight-like.
I made this a long time ago for Knox. It's a cannon room. The ball catcher is supposed to be cannonballs. I didn't have the best floors and walls unlocked then, lol. And those are some pretty sloppy window patterns. But I hope it inspires you! I'm kind of on a HHD roll today, so if I make any more castle things I'll be sure to share.