You can use the template provided to design your own skins, though you might want to know this:

Because plates cannot be mapped, a matter of fact is that you can use skins by Abraxas here: http://www.lcpdfr.com/files/file/4120-vdh-vanilla-cars-textures-megapack/

However, do whatever you want with it. You are free to create your own skins and place them into this cruiser or anything similar to Sameer's template.

My disclaimer for this: do not include the template in your release; include the link to this car mod instead.