@t.albers, that's great news; your write-up will be a great aid. My first candidate for changing windows configurations will be to model a Northern Pacific North Coast Limited "Traveller's Rest" lounge car.
These "Traveller's Rest" cars were heavily promoted by NP along with their vista dome cars on the NCL. And are a separate purchase car in GGD's forthcoming O scale, NP NCL passenger train set.
Looking forward to your photos and techniques.