At the moment it's super easy to just rez in anything without bugs (mostly). There's only an active area around the player - everything leaving that area is destroyed and keeps the game running smooth.
Saving stuff gets super tricky when anything moves out of bounds - you have to manage the enemy leaving active space and then being saved without overlapping saved map.
But yeah, you raise a good point because if I go into Junkyard, find a power cell and then march to the station to free up a slot, I'm going to be super sour when I get back and it's gone. I think I will work on the zone recipes first and then see about moving the current system from spawning quick chunks to static zones.
* This could also mean fun stuff like coming back for blocks and the game could see about spawning an enemy ship that's stolen them.