I'm not quite sure what you mean by a "project build", so I'll assume you are iterating your sound design in a packaged game, and not using the editor.
If you are using .pak files for your built game, you are out of luck. We have added code to the project packaging code to add the SoundBanks in the .pak files along with the rest of the game's assets. I would suggest that during development, you don't use .pak files (Edit > Project Settings > Packaging > Uncheck "Use PAK files"). That way, your content folder will be visible in your built game. All you will need to do is re-generate your SoundBanks and copy them to YOUR_GAME/Content/WwiseAudio.
If you are using the editor, everything should just work once you generate your SoundBanks.