Well, you've managed to do 13 cars in a space of time where I have only managed 2.75. But my cars are bigger than yours - haha!
Your version of the Golden Nugget is of course unique and a masterpiece. I have the Streamliners book you mention but never took much notice of the references to this car. As you have found, books and web resources with blueprints and photos don't reveal what you get from museum and university library records about vital details on interiors, furnishings and sometimes even the car staff. Knowing who they were and being able to include a representation of one as in your case is truly special.
I have done that with an MKT car. But my Holy Grail in terms of a lounge car, which I may try to model some day, was not in the UP fleet but this tavern car in the SP Daylight fleet:
