Looking at some of the wallpapers (which are pretty damn cool), it appears that the Keep was built at the base of a very sheer cliff. Is this the case? Playing the game itself, there doesn't seem to be a good view of the immediate area around the Keep. I played the original PnP module 25 or so years ago, but I can't remember the surroundings of the Keep. Anyone know the lay of the land?
The sheer cliff behind the Inner Bailey is, as you say, very cool, and is there for artistic effect. Otherwise, the Keep is built on top of a mesa - you go up a winding road to the top and talk your way in. Very defensible.