Thanks for the replies! As I've said, I understand the appeal. I am not denouncing the walkways, only presenting an alternative that I personally prefer. Mordheim is a far more interesting game with a vertical element and the walkways provide that for very little effort and cost. There are absolutely gorgeous tables that use them, and I would certainly prefer to play with them rather than without them.
However, I think my wall provides similar benefits, and suffers from fewer of my minor gripes regarding walkways. For me, they are also far easier to build than most of my other buildings.
I've got no more pictures of finished works, so you'll have to excuse me one time for posting a work in progress:
It is a crane. The hoisting rope is still missing, but would normally be twisted around the axle, and slung over the end of the beam. People walking inside the wheel could then hoist of lower a load attached to the rope.
Due to the crossbars on the beams, it also functions as a laddder that can reach the top of the wall if positioned towards, or alongside it.