To combat "pillaring" that blocks others from building, why not implement a minimum of 15 components to constitute a structure. The specific number of components ( walls, foundations, pillars and ceilings ) would likely need fine tuning, however I think it may be a good way to prevent this behavior. It would end up being very "cost" prohibitive to build small shacks all over the map to achieve the same result as a pillar with a ladder on it does now.