Layer 1
Layer 2
Layer 3
Layer 4
Layer 5
Notes
- The full gray squares can be any solid block (except blocks of redstone anywhere, or bedrock/obsidian for the door itself).
- The empty squares in Layer 2 should be lit with a torch, otherwise mobs can spawn inside.
- This design can be easily extended to be 3 blocks high - simply place redstone dust on top of the blocks with redstone torches underneath.