The bonuses need to be added to a mod, they're entity files in the GameInfo folder and also need to be added to the entity.manifest. Then you need the bonus texture sheet and that is access by brush files in the Window folder.
Then add the bonuses to all the Planet.entity files.
And thats to just get the bonuses. Good luck.
I am importing Sins Plus in my diplomacy mod now. The bonuses do work but all the info added to the GalaxyScenarioDef.galaxyScenarioDef is giving me a hell of a time.