[Suicide Junkie]

In a pirate game, it already happens that a Human (pirate) race cannot build baseships.

A Human Pirate race already "cannot" build BCs.

Although it is technically possible to build a Baseship as a pirate race, at 50% build + limited resources, it will take around 75 turns to finish a baseship. Even LCs take over a year to build.

It will also require the scrapping of a LOT of LCs to fund the construction.

--------------------------------

About removing resource facilities for Pirates.
If we don't allow Pirates to build any resource extractor facilities, thier home planet will be filled up with research centers.

With 200 per turn + 50K starting, they could build an escort with a mineral miner quickly, and use it to start their economy. Alternatively, an escort with a (Pirate)SY could build a base with lots of mineral extractors over the nearby planets. By mothballing, you can avoid wasting minerals you can't store. Upon capturing ships, the pirate economy would shift over to the faster and sustainable (extractors deplete value) thieving economic system.

With all the research available, they could get ship capture tech quickly, as well as research repair & armor techs for better capture abilities.