A new planet idea for the 1.14 update. A planet that is entirely inside the core of a planet. Essentially instead of the map starting from 0 and building up, it would start from 256 and build down, with a large ocean towards the lower y values. The whole map would essentially be upside down, and players would spawn in large holes that go down into the planet. Bases and settlements would have to be built upside down. Would be an interesting planet.
Yeah that would b supper cool! Only issue I can see is how it would b very hard for ships to attack and for water and lava to flow. Also how you u grow food and or walk?