Really cool mod, but damn the planetary building is way too op, it makes refining, mining and fuel production almost irrelevant.
My suggestions on how to balance:
Just make it cost an industry slot without the upgrade, and remove the possibility to upgrade.
or
Make it scale worse with planet size, like void extraction from "Legacy of Arkgneisis" by Gwyvern mod did.
Unique solution I thought on the spot:
If you want to get more "spicy" you could make the industry increase the hazard rating of the planet if built and keep the same output. It would make sense lore wise I guess

Anyways, Lovely mod, and no matter if this get changed or no, I will still like the mod, good luck.