Symmetry issue

John the Late writes: What he means is that the cliffs are like this
X X X|X X X|X X X
X X X|X X X|X X X
X X X|X X X|X X X
so if he makes a gap, a 4-tile wide gate cannot really fit in, because it will always be a 3-tile wide gap.

A solution would be to delete 2 parts and add a piece of wall on each side, or to place the gate in some kind of an out-wall down in front of the cliff.