Megastructures: Major update idea

One of my favourite sci fi concepts that doesnt really make an appearance in the game are megastructures. Its really a shame because i feel like theyd slot perfectly into no mans sky

there could be a few kinds of megastructures you could find in various states ranging from under construction, Complete, and ruined. Sentinel hostility would be tied to the state of the structure, under construction would have aggressive sentinels. Ruined would have low sentinel activity. Complete would have high sentinel activity.

Ring world. essentially a giant ringed satellite orbiting a star. there would be a landable surface on the side anterior to the sun and potentially various POI you could enter from the posterior side to explore ruins of the substructure

O'neill cylinder. O'neill cylinders could spawn in place of the moon of a planet. they would be large hollow cylinders you can enter from one end and fly your space ship in. Depending on their state

ecumenopolis would be a new biome type found on planets. A planet spanning city covering every inch of a world. no longer inhabited