Sky bases are not common but work well.
To build this type of base find a spot where there isn't any factions nearby and start pillaring up to height limit. When you reach height limit dig down 5 blocks and start designing your base! After you are finished set your faction or normal home there by doing /f sethome or /sethome then dig out the pillar that you made to get your base.
- Advantages are its not very common so when people find the claimed territory they will most likely dig down, you can exit your base if its above the ocean, lighted TNT that is shot at it will fall below if the tick is delayed.
- Disadvantages are it casts a shadow that can be seen, when you pillar up to build it you have to destroy the pillar, and if a player has 16 view range they will see it.
To build this type of base find a spot where there isn't any factions nearby and start pillaring up to height limit. When you reach height limit dig down 5 blocks and start designing your base! After you are finished set your faction or normal home there by doing /f sethome or /sethome then dig out the pillar that you made to get your base.