My 3x3 chunk castle with underground farms, built in mythicmc server.
Contains of semi-auto farms, water pipes for item transport system, darkrooms, 2x2 piston doors, toggleable lights, etc...
Castle gate is located on east wall.
Spawn point is at NW point of castle, it's best to be at y69 or above when spawning.
Some piston doors may be initially open after spawning, which need to be fixed manually by moving redstone blocks which control them.
Also, wait at least 3 secs till buttons release, to prevent sand blocks breaking in switching mechanisms.
I hope you'll enjoy it