Sorry for the late reply, I just ssaw your message. Well you can do this:
- go to the skin folder and look for Blancpain_Numberplate_ProAm_Colour.dds and Blancpain_Numberplate_ProAm_Emissive.dds
- You can use blank small textures (with alpha channel) in order to hide the numberplate or simply rename those dds files.
- You could also rework the texture(s), if the class you intend to portrait has similar shaped numberplate.
If you need a different shaped 3D numberplate, then you should use a 3D editor in order to clone and modify the shape of the existing one(s) from my car and shepe it the way you want it, save it as an external .kn5 file and load it/them in game using CSP code.
But if you just want to skin the numberplate, once you got rid of the numberplate the way I wrote you, you're good to go, create your skins with the numberrplate inside it.