I found this model on GrabCAD by Joshua VanName.
https://grabcad.com/library/the-lamborghini-terzo-millennio-concept-car-1

It's an awesome model but not at all 3D printable.
It took a long time to make it 3D printable, but I finally finished it.
I finished printing it, but haven't painted it yet.
I will post pictures once it is finished. I won't be able to paint it until spring when it warms up.

As far as assembly instructions, I included the model "Assembled_Do_Not_Print.stl" for reference.
You can open it in Meshmixer and do a "separate shells" to see where the parts go.

I recommend printing this on a smooth sheet (or maybe the new Prusa satin sheet) so that the body halves will fit together better.
I don't have a Prusa satin sheet (yet), but I would be interested to see how that would turn out.

I printed the body and almost all the parts at 0.10 layer height.
Everything was printed in PLA, except the tires. I printed them in Flexfill 98A.

The following parts need supports everywhere:
Body_Front
Body_Rear

The rest don't need supports.