Hello,
Still the same subject but duplicate threads.
Whatever, you have to internalise your geometry it will help.
To make 8 triangles it is faster in Rhinoceros.
Some test, no very beautiful !!
Triangulate tower 1.gh (18.0 KB)
As you seem desesperate 
Here a more beautiful version 
You will need Rhino 6, MeshmachineStatic
Triangulate tower 2.gh (22.1 KB)