The project took about 6 months. Most of that was waiting for the artists to do their magic. I had the stamps (for the book covers and the slipcases) from a previous project. The stamps interesting enough were made of magnesium and the drill holes for mounting had to be done at a very very low speed to keep heat low and avoid them igniting.
Chadbourne was given ideas, but the other artists were free to create what they wished, the only requirement was that they did at least one piece or more for every story.