I built this together with a friend on the survival-pi SMP in survival. We built this over several months and use it as our main survival base.

We have a village with cured villagers for all enchantments. We also have a large sorting system that sorts almost every item. The sorting system is still a work in progress and we're planning to rework it for more items and less lagg. My friend built a custom piston door for our gold door entrance. This entrance leads to the entry hall with a mirror floor. We built this mirror by building the hall exactly mirrored below the glass floor (The mirror effect you can see on the picture can also be observed in Vanilla :)). We did a lot of terraforming and seed planting for the landscape around the castle and for the beacon room inside the castle. We use those fields a lot for the villagers and for food. Additionally, my friend built an fully automatic brewing factory hidden behind a difficult to solve secret entrance.

The castle is still a work in progress. We plan to add many more rooms and upgrade the storage system.