Base Building
Base Building is a rumored upcoming, brand new feature for ED: Odyssey. Little is known about it except datamined info from the memory dumps of recent game updates and the Arx store description.
Findings
Arx store
In 2019, the Arx store's page source had the description: "Arx is the Elite Dangerous in-game currency used to buy customisations for your commander, ships, SRVs, fighters, weapons, and buildings."[1]
Building Schematic
In 2021, Odyssey added the Building Schematic which is obtainable at a settlement.
Memory dump
A memory dump of Odyssey update 17 shows a list of new features related to base building.[2] Update 18 shows more strings associated with base building in the RAM dumps.[3]
The following is known based on the memory dumps: land can be claimed and purchased to build a base.[3] There is survey data, a map and terrain view for materials, minerals, radiation and resources.[3] Base building has a special camera mode and a building panel.[3] The buildings cost credits and resources.[3] Add modules with decorations, move, name or demolish them.[3] Human NPCs and drones are at the base.[3] There are hangar gates, external doors, scenery, rocks, structures, rooms, character customization area, shipyard customization area (for small, medium, large ships).[3]