Hello, this is my first map that I've built. Everything is done using command blocks because I don't know how to make data packs, so it might be a little clucky around the edges but it should run relatively smoothly. There is nothing below the islands this is for map reset purposes. There is a mess of villagers for the shop, if one of them runs out and does not reset after you leave the trade GUI you will have to run this command:
/summon villager ~ ~ ~ {VillagerData:{profession:mason, level:5, type:desert}, Invulnerable:1b, NoAI:1b, Offers:{Recipes:[{buy:{id:(previous item), Count:(Previous amount)b}, sell:{id:(previous item), Count:(previous amount), tag:({Potion:invisibility} only if the previous item was an invis potion)}maxUses:999}]}} after killing the previous villager, after this if done correctly they should restock automatically. If a bug happens please do post a comment on it and how to replicate it so that I can fix it.