This is a Blender file that you can open and have a ready to go model that you can paint on!

To use it just open the file with blender.

Blender Download: https://www.blender.org/download/

These are the tutorials that I used to learn how to use blender to make liverys:
AirBiscut - Blender Livery Painting
vLegion_ Using Blender To Make Liverys