So, the only things I (this is to be read "my hubby, who I tried to lure to help solving the clues and who got bored after a while") have discovered so far are:
- the names of the books make Carlstadt, NJ. When you look up the town in Wikipedia, under "Economy" ("The Economy of Following" title is not included in the acronym), you see "Pantone". This has to be related to the cards in the Scullery.
- the symbols above the windows in the Drawing Rooms are from the alchemy - sulfur, gold, mercury, silver, tin (if I remember correctly).
And I have no clue about any of the questions or anything else.