The skin looks really great... but you should use the metal_detail instead of turning the whole thing 4096² uncompressed. 200 MB for a single skin is way too much (the car itself is just 42 MB). Also, another uncompressed 4096 solid green for the map is neither economical nor what a map texture is meant to be, tire_blur is not needed in that resolution - conclusion, keep in mind that people want to use this in 30+ car fields and not everyone has 8 GB of VRAM :)