From several years back.
The image attached was my original conception of the novel Story House, including characters whose names later changed e.g. Freddy = Elliot. Rebecca became Esther.
Various critics observed that the book was architectural. It was a built thing. Yes, indeed it was. Here is the wacky blueprint. I largely ignored it while writing, and various aspects dropped away. But it’s the only writing project I can think of that I’ve approached this way. Ideas, drawings, execution.