Here are some tips on building your tower and your almena.
Tower with the almena on the first floor
Make a 3×3 wall on the first floor and put the almena walls beside it
At the second floor use any floor you want.
Put the tower over the floor. Please note that the tower is cloned from a rug so I could make the object higher and make a different visual effect. It looks as a 3 floor castle 🙂
Tower with the almena on the second floor
Make a 3×3 room on the first floor and a large 1 tile wall beside it.
At the second floor use any floor you want over the 3×3 tile room and over the large 1 tile wall.
Put the tower on the second floor over the 3×3 tiles room
Put the almena wall at the second floor over the 1st floor (1 tile large room)
2 different views of the finished tower. I’ve intentionally used a first floor almena on the left side of the tower and a second one on the right so you can see the difference. The tower is about one and a half of a wall height, unfortunatelly we cann’t make a 3rd floor yet 😉