In my world, there is the working class, who live in a giant cube called three cubed, there are 27 districts and each are responsible for different things. Three cubed can not only provide for itself, it also supports the upper ruling class that resides on a floating island above the cube, New Eden. However, the Three Cubed is run on an energy source called God's blood, something only located in New Eden. Assume the technological advancements are well past modern 20th century.
What factors are needed for the cube to work properly? So far, I've noted down the following
renewable energy source (New Eden)
Repair management system (for when the system stops working)