Concerning reflections of environment and cabin, that can be done with the AO texture. Mike was telling how this works in Asobo with interior and exterior settings.
Ambient occlusion channel, but it’s not just glass, it’s all materials applied to any interior model. If ambient occlusion channel pixel values are above 180 or so you will get mostly exterior reflection. Below 100 it will be mostly or entirely interior reflection (using whatever reflection map type you’ve chosen, there are a few now). Values near 128 will show a blend of the two.
Many thanks for the follow up, unfortunately I am unable to test until January 2025, let’s hope one of the other members on this topic can confirm earlier.
If not I will let you know when I am back from abroad next year.