Stewhr - I built it as a mini board to use for modified scenarios based on Atop the Walls from the Gondor at War book and The Walls of Minas Tirith scenario from the Return of the King sourcebook.
As it is only to depict the top of a wall for the Gondor at War scenario, the seige towers won't be complete either, only the top, no wheels.
I did do a small piece to finish the wall if I don't want the tower.
I also build some slide on pieces for the bottom to have it depict a complete wall so it can be attacked using ladders or the Murmak.
Further modifications in the back of my mind is to add a small extension where the tower is, going back to a beacon maybe.