I don't know of an easy way to load it so I can't look at it until it comes back on.
What stops the team on top from camping up there? They can rain down arrows if the team on bottom tries to come up the stair side (or cliffs) and if I remember correctly the bridge is the only other entrance to their spawn. Guard the bridge that takes the enemy forever to get to and you hold the high ground at all times. Mainly cav left to fight? I'll just hang out on one of the many 80 degree cliffs. The cliffs are really an engine problem, but you have to map around that. Asymmetric maps are good, but you can't just grant one team the high ground. There's nothing for the team on top to leave their spawn to fight for, they already hold the most advantageous position.
Correct me if I'm wrong, that's just how I remember the layout.