[How to use the livery texture]

Could someone explain how to use the livery texture. I believe it is related to the external model files but I don't understand how to properly use them.

[Pink tail possibly due to missing decal?]

I suspect it is due to missing a logo_albd texture.

[Part of underlaying model sticking out]

Seems to appear only with showcase cam. It's seems to be a transparent part but it does cast a shadow.

[Part of underlaying model sticking out]

A part of some underlaying model is sticking out of the area above the cockpit leaving weird shadows.

[Pink tail possibly due to missing decal?]

Hi,
When I have the model.a330_200_ext included in my repaint this pink area overlaps the vertical and part of the tail. When I exclude said model all decalls disappear.
I don't believe there is a decal for the tail. What's missing on my repaint?