Thinking about it a bit more, I'm no longer so sure about the connection between the Royal Scottish Academy columns and the Thinkamancy Temple. We know that the Peter Doig Exhibition didn't inspire the Thinkamancy temple, but I'm not sure that it works the other way either. I have only the bonus pages of Book 1, so I can't be sure about what might be in the bonus pages of Book 2, but the illustration of the Thinkamancy Temple in Book 1 doesn't seem detailed enough to have inspired the Peter Doig Exhibition. The Peter Doig Exhibition is very close to what we are seeing in the Epilogues, but the Epilogues didn't start until after the Exhibition started, and the Royal Scottish Academy couldn't have known that it would look right just from the tiny rough picture in Book 1.
So either Book 2 includes a better picture of the temple in bonus pages, or else the Thinkamancy Temple and the Peter Doig Exhibition are both imitating some third thing that predates them both.