For the "Main" parts, use 0.4mm perimeter thickness, recommended 0.2mm layer height.

The parts are in the position I printed them. Remember to "block" the supports in Cura once all the base of the part is reached, or "paint" the base of the part in Prusa Slicer so you avoid supports any higher.

The front bumper, printed upside down, the rear bumper in its natural position, the lower sides upside down, the front part rotated 90º clockwise seeing it from the left, the same than the central part, and the rear part 90º counter clockwise also seeing it from the left.

You will need to do your best and adjust perimeter thickness for the smallest details like wind-shield cleaner or the rear grills

For the light covers and windows, try to print them as thin as you can, to improve its transparency.

You can use M3x8mm screws for all the holes but for the centre front one, the one linking the Main Front and Main Front Bumper. Cut one screw to be around 4mm long for this one.