Question - Is the functionality there in the SDK/Sim to add a livery that changes the exterior model gltf?

I am playing with liveries and am trying to take it to the limits. So far I have made a livery of a default aircraft (that has DRM fsarchive type files)

I was able to make a project to add my own aircraft.cfg and texture.xyz folder. - shows new livery in sim
I was able to make a project to add my own aircraft.cfg, panel.xyz folder and texture.xyz folder. Shows new livery with a new glass instrument in sim

I was able to make a project to add my own aircraft.cfg, panel.xyz folder and exterior model.xyz folder and texture.xyz folder- However it will not show the fallback textures for the interior. It will show the textures that are in the base model texture folder, but any of the fallback textures show as pink. Even materials with no textures (ie glass instruments materials with no texture slots) show pink.

Question - Is this last project something the sim can do? I was hoping to show in my tutorials, how to make liveries, with different features.