Archivists Shulker Farm

This is a single dimension shulker farm originally by Balllight & The Archivists for Java 1.17 and up.  Something changed in 1.20.5 that required minor edits to their original design, but a subsequent Minecraft release changed things again.  This schematic remedies the core problem with where shulkers land. 

I've only tested it in 1.21.4, where I get a rate of about 1000 shulkers per hour while AFKing it, after the first death happens.  It initially takes a couple of minutes for enough shulkers to be duped to start entity cramming.

Please watch the excellent original video to understand the basic mechanics and tips for how to get a shulker to and into the farm.  IMPORTANT: as far as I know, this is still directional, and should be oriented with the AFK hut on the south side,

Changes to this version from the original:

• The holding areas had their slabs removed, because shulkers would no longer teleport into the bottom slab and stick there, but would teleport above the slab then keep teleporting as they tried to find a valid place to sit.  They now seem to be perfectly content perching directly on the hoppers.
• Shulker bullets would occasionally get into the AFK hut, and the hut itself was difficult to enter.  The soul sand + fire trick recommended in the FAQ on the video wasn't stopping them, and the fire was visually unpleasant.  Replacing the front of the hut with a pair of stairs resulted in zero hits over more than an hour, and teleport-proofing with buttons made it easier to enter.
• There's an optional end rod on the front of the hut, solely for providing a little bit of light.
• There's an optional scaffolding tower to make it easier to access the various layers of the farm.