Later, to make another roof was made totally the same process with 3 angle cylindric figure. The colons were also made with the same cylindric figure but, the number of angles was changed to 13. After 1 colon was made it was cloned (copied) clicking the right click of the mouse and chosing CLONE. That is how the other colons appeared. To make sure they are standing correctly on the same line helped top view where it is easy to correct.