It is done with Daz. But if you go back/search in this thread you will find that the Dev (Alishia) doesn't want to share her OC. The models are all customized heavily, based on Daz assets they own. It would be very difficult to backwards engineer with just the RPY images/files. You'd need a very in depth knowledge of all the assets, and know how to sculpt/edit them to look as they do in The Red Room... During all that you have crossed the ethical line of artistry, and copied an artists work against their will...
Unfortunatly, unless they change their tune, the assets will remain in their possession.