I think I've found most of the models that are in both levels, the mansion is pretty bare with models. The final release definitely has more textures than models that were used in both. But i'll continue looking later tonight. Also could someone help me look for the model that the fireplaces use in the Ghoulroom, i can't find it at all.
So, add this to doc. Everything what is close, similar can be usefull. Also, I'm checking objects in other way than you. I just selected first better image, and I circle every thing. for example I circled whole front of Ghotic Mansion, because Ghoulroom have exact copy of this model, I also give numbers to textures, and I noticed that everything what starts with GM-GhoticMansion, was from that level =)
This is gonna be my interpretation based on scratches from original dialogs and text. But, I don't promise anything. It gonna be infinitely hard..., and without volunteers help, it can take a while... I'm skilled, but I'm not good in everything, so if you want this mod how quickly as possible, I need some extra help what... especially someone skilled in 3D graphics.