my only gripe is that the ground looks like a carpet a bit, or like some fuzzy felt. But otherwise perfect!

I used 2 gradient nodes with quadratic gradient type, after them used color ramps for smoothness and math node to add them together. With math node i mixed orange and red car paint materials (shader mix node). Nothing fancy really. For all this to work i created "project from view" uv map with all needed objects selected. Here how it looks: https://steamproxy.net/sharedfiles/filedetails/?id=3161921091

This is fucking beautiful overal. The color is perfect, esp how you made it gradient like that, really, really well done.