You cannot build a Birch World or a HRAE-MC without the corresponding Ascension Perk. To unlock all Gigas perks instantly:
The empire was dying. Not from war, nor from famine, but from the heat death of their own ambition. They had run out of space. stellaris gigastructural engineering console commands
If a Gigastructure is stuck (common with the System-scale Complex), type: event giga.1000 [megastructure ID] This retriggers the upgrade event chain. Replace [megastructure ID] with the actual ID from debugtooltip . You cannot build a Birch World or a
I can help you find the exact ID or the pre-requisite tech code so you don't have to guess! nor from famine