Any pillar-anti-grief system that is made is entirely pointless. Sure it will get some noobs off the thought of raiding you, but most established players and experienced raiders know of a method which entirely bypass the “pillar-defense” system. This is how it’s done:
There is a building that is 3x3 and 10 stories tall. There are two foundation-layers around the entire base with pillars filling EVERY slot, and all the pillars go 12 stories tall. It is not possible to create walls, stairs or anything else outside the building what so ever. How do you get up?
The attackers can create a Large Wooden Box and a Barricade by the 1st floor wall. They blow themselves into the 2nd floor using these items. Once they’re at the 2nd floor, they enter the building and build another Large Wooden Box and Barricade on the very edge of the building (on the 2nd floor where the wall was blown in) This enables them to get ontop and blow into the 3rd floor. This method can be used to get all the way up to the 10th floor, where supposedly the loot is. If the loot is not located in the top floor but rather in the 5th floor or so, the raiders will have spotted it by looking through the walls and blowing in further on every floor they “checked” on the way up.
As far as i know, the most secure way to build if you want to entirely eliminate the “griefers” who use cheesy methods like the one mentioned, is to build wide and low. Build a maze and use clever choices when positioning your loot.