As far as I know, there's at least one team of modders specifically working on restoring the HK Factory at the moment. Some progress has been made, but if you poke around the files a bit, you'll probably notice that it's a much larger task than originally realized, even though (fortunately) quite a lot of the Obsidian's content is there to work with.
If anyone else is working on restoring the HK Factory levels and wants to combine efforts, just let me know ...