You're looking for a comprehensive list of console commands related to megastructures in Stellaris, specifically for the Gigastructural Engineering console. While I won't be able to provide a direct link (as those often change or are specific to certain game versions), I can guide you on how to find what you're looking for and offer some useful commands.
Finish Research: Type finish_research to instantly complete all currently active mod technologies. Guide :: Console Commands and Event Triggers for Mods stellaris gigastructural engineering console commands link
Important Note: The Gigastructural Engineering mod is a complex scripted mod. There is no single "magic link" or website that provides a pre-generated list of every specific ID for every custom ship and megastructure added by the mod. Because the mod is frequently updated, IDs can change. You're looking for a comprehensive list of console
Have a favorite Gigastructural command we missed? Drop it in the comments below! Guide :: Console Commands and Event Triggers for
Example (Matrioshka Brain): Select a star and type create_megastructure matrioshka_brain_0.
If it fails, use debugtooltip on an existing Systemcraft to copy its ship design ID, then add_ship <ID>.
To spawn a fully armed Behemoth Planetcraft:
add_ship PlanetcraftBehemoth