No. The the art on the seventh door does not matter and will not help.

No. The Book describes the format the answer is in.

Moira mentions something is different in this chapter. That's what's important.

Yes. All the doors matter.

Yes. Yes it does. If you had a spreadsheet, it would have been helpful.

What haven't you used yet? Keep in mind Hint 03.

You only need to worry about the attributions of all epigraphs. Find a pattern.