Empty space around Wall

We are making wall and back house of them.

How about empty space around wall.
You cannot build anything around wall.
how do you think? or permit just few building around wall?

Just use the grid mod and small tree mod. The ground will be covered with tiles. With small tree mod, trees do not block your vision. You can see an empty tile very clearly if there is hole in wall.

But why would this be good?