Now it seems that the second screenshot doesn't work anymore. Anyway:

Emp: those buildings in the walls are in layer 5. Layer 6 and 7 contain a lot of buildings. But I understand what you mean; it might look confusing so I'll put something else in the walls.

EM: that was the level in an early state. The level is pretty big and open. The EC might be a bit random in the walls. But I'll have something to show when the level is done (that could take a while)