[Captain Kwok]

I think so. When adding a custom race to the Balance Mod, I had no problems with the game displaying the images from the custom race's default install in the stock Empires folder. But the text files should be on hand in the Mod's empires folder under the custom set's name - all of them for a PBW game with AI generated players. But the most important text files for player controlled empires I believe are [Empire]_AI_Main.txt and [Empire]_InvConfiguration_Slots.txt.