I wanted to create a main destination/headquarters for each galaxy in my story but a single planet or megastructure didn't seem grand enough.
My idea is to have a vast number of structures from rotating space habitats to non-rotating structures used for storage, computers etc. All structures will be joined together by strong cables to keep them from wondering off or needing to use too much fuel to keep its position.
The arrangement of joined space structures will not be orbiting anything, they will be stationary in a set location far from any celestial bodies that could gravitationally influence them.
Carbon nanotubes, steel and aluminium will be used for the structures and possibly the cables. Nanotechnology is used within the structures for different purposes.
The majority of the structures will have masses between 100 million and 10 billion tons with possibly smaller structures of less mass along the cables. I haven't decided on the size of the whole arrangement of structures, for starters I was thinking that it can be an astronomical unit in diameter but if that is possible then it could be larger.
Could a collection of tethered space structures like this exist if they were spaced at a distance to keep them from collapsing due to gravity? If so what would be the minimum distance between structures and how large could a collection be?