I give you the theoretical megastructure: The Alderson Disc.

There are 6 habitable biome bands around the center star.
1st band: Retaining wall, a wasteland of rock
2nd band: Lava lands
3rd band: the desert
4th band: the plains
5th band: frozen plains
6th band: ice outer wall

There are several settlements scattered throughout the map in different biomes.
There are dungeons, mineshafts, and strongholds.
This has been by far my biggest map ive ever made, took over a month of work but it was worth every minute :)
it "should" be able to be converted to the newest version of minecraft with no issues.

The spawn point is in the 4th band near a village, the star's coordinates are 0, 0, dead center of the map.

This map is 7000x7000 blocks
This map is 100% fully survival capable
This map supports multiplayer
This map was built in version 1.12.2 and has NOT been tested for other versions
This map requires NO shaders NO textures NO mods NOTHING! 100% vanilla compatable!
All of my maps are made in vanilla so that everyone can enjoy them.

Any bugs you come across please let me know so i can fix them asap!

Please leave a comment and let me know what you think!