Here is my variant of a rook. The problem here was to make those spacings between merlons square, not triangular. I beveled edge ring on the top and got those recesses and some N-gons as a result. Subdivision would create too much of unnecessary geometry.
I don`t know what is better really. But the way I did it gives better LP look, harmonic proportions. Also it is still pretty close to the reference. At least the outline.
