You build on it.. Didn't you see the animated picture? It shows bricks on the map to change how it is.
Also, I played the map and liked it before I even saw this topic. I think when you are playing a DM you arn't even paying attention to the wall design. I made a CTF map with air vents scattered around the build to launch you higher and lower.. Above the bridge I had a big anti-grav bridge, Very fun.
8/10... Looking at the map more carefully you COULD have probably aligned it to the brick grid and aligned the textures, but it's still very fun to play around in because again, you don't even notice things like that while playing.
