looks really good, im excited to see more. however it needs more c u r v e I suggest redoing the front end to also resemble a Lincoln Mark VIII and releasing this as a new model under Gavril (as Burnside is canonically defunct by the early 80's) with a new motor to boot (similar to the 4.6 Quad cam in the Mark VIII) A coupe Grand Marshal makes no real-world sense, this would 100% be sold under a luxury marquee at the tail-end of the personal luxury coupe craze, but we really dont have that given official lore for Gavril. So my next best suggestion, like i said, is release it as a new, up-market model under Gavril as a sort of "flagship." that's the next best alternative to at least make this car make some real-world sense. Again, its gonna take more work, but its going to create a mod with a much stronger legacy if you do it right. Good luck
So far, the priority is to make a coupe version, in the future we will see, because it will be good if there are more car options.
