This is something I think some of you guys might find interest in.
The GR Supra concept - essentially, there's a pretty large interest in that car ever since it was created, showcased but never released. I'm not sure if anyone else has undertaken the project - with the lack of models I doubt anybody has (The GR Sport conversion is a disaster).
WITH THAT BEING SAID, however...
After much searching, I have found a workable Supra GR model by a dev named GM25. It's not the most amazing Supra model available, but it's very workable and editable. Here are a few shots after I loaded it up into blender:
It has a very basic interior and is lacking some details (some grilles, wheels, etc). HOWEVER, what's so good about this model is that it comes with necessary textures that are all labeled and organized accordingly (Glass, light map, etc) . Furthermore, the body itself is clean and parts are named. After inspecting the model, I didn't really find any geometric errors (holes, etc) within the model itself. If I had to judge, it seems very importable.
Now, even though I do some modeling on my own time, I've never developed for AC. I can definitely undertake the project of putting this into the game myself, but I'm sure that it wouldn't come out as well as if someone else who's experienced did it. With that being said, if you are interested in potentially converting this, please reach out to me! I will be willing to send the model. I'm still going to be working on this myself and attempting to eventually get this done as my introductory mod to AC, but if someone is looking to get this into the game quicker and better than what I can do, please do let me know! Thank you all.