Minecraft Elegance: Instant Shulker Farm ("Methuselah", Java 1.17)

Extremely simple shulker farm lasts *several hundred hours* on average without restocking, averaging ~100,000 shells (or ~200,000 duplications) before failure. Can be built in about 30 min, not counting time to move and load the shulker. Detailed tips are provided for easily moving a shulker from the End to Overworld.

Discord: https://discord.gg/G9aa2YTTQX
World download: https://www.mediafire.com/file/cgfshdk16jifi8l/IanXO4%2527s_Instant_Shulker_Farm.zip/file
Litematica files:
https://www.mediafire.com/file/6urunckzgfy2pfv/IanXO4_Instant_Shulker_Farm.litematic/file
https://www.mediafire.com/file/2reavxu72pi7sgr/IanXO4_Wither_Rose_Shulker_Grinder.litematic/file

0:00 Intro
0:45 Material List
1:05 Mechanics
5:21 Build tutorial
13:14 Shulker loading
18:25 Longevity and productivity
18:51 Restocking a shulker from backup
19:41 Overview of restocking portal
19:58 Exit Portal example with different surrounding terrain
20:04 Alternate grinder design with wither roses
20:59 Zombie piglins will sing for you if you make a trap with a wither rose and turtle egg.

NOTES
1:53 The scaffolding protected the new shulker from being hit with its lid closed.
8:52 The grinder can be placed under the nether roof as well, but the reloading system assumes that the the nether side of the farm is higher in altitude.
9:14 I made a math error when dividing the Z coordinate by 8, but the farm still works.
16:00 If someone enters the End dimension, the rails on the platform will be removed by the game, but the rails will remain intact when using a gateway.
17:14 Some players recommend an invisibility potion while transporting the shulker to the Overworld.
18:25 One instance of testing ran for over 1000 hours and produced over 250,000 shells (over a half million duplications) without restocking. Eventually, I ended the testing without any failure because I wanted my computer back.
19:41 Make sure that the portal is more than 8 blocks away from the farm below so that shulkers cannot teleport there. The sign protects the underside of the soul sand block from teleportation while letting the minecart fall through.

BREAKING BOATS and ALTERNATE GRINDER
The boats will break on occasion due to being hit by a shulker bullet. This normally happens very rarely - maybe once every several hundred hours - but some players report a higher incidence. The farm only needs 1 boat to operate (it's fast enough to keep up with the farm), but if you notice that a boat is missing, it would be best to turn the farm off and reinstall the missing boat. If you have wither roses, I recommend upgrading to the alternative grinder design at 20:04, which doesn't have any boats or minecarts that could break.

REFERENCES:
Rays Works https://www.youtube.com/watch?v=jaC0YUpKlIs
Cubicmetre https://www.youtube.com/watch?v=4nNXxyz8yXQ
Kdender https://www.youtube.com/watch?v=UXreOTia2vo
Devilmok https://www.youtube.com/watch?v=xaD8Qyi942Y

FASTER FARM
The farm normally works at 236 shells/hr, which is enough to store over 200,000 items per hour. Most players simply do not need a faster shulker farm because you can't possibly fill them fast enough. That said, to double the speed of the farm, break the upper scaffolding at the duplication chamber and replace it with a stair block. The faster production rate comes at the expense of having to restock the shulker more frequently. You'll also need to double the capacity of the grinder to handle the additional shulkers.

BUGGED SHULKERS
Very rarely (maybe once per thousand hours) a shulker may not open its shell, and yet it will be able to fire off shulker bullets. The scaffolding will protect this shulker from harming itself, but the farm will not produce shells. This is easily fixed by restarting the game (if single player) or server.