Yes, I did notice that. It's actually a pretty good car, it even has Software Rendering. It does have some minor flaws, which I'm hoping I'll be able to fix. However, I'm not going to take anything from that car to make my conversion.The Cadillac is already made with all the colors.
Also, I think the author of that car (HPB_Forever) is no longer active in the community (correct me if I'm wrong), so I really can't get the permission to use his car in my mod.