Interesting… This project is a good candidate for not needing a pcb, I think. So , after I practice & create one that works I will learn to edit that part out of the fritzing fzp file.
The Sony ext board in here has pcb eliminated as it isn’t useful. Basically I was lazy and just removed all the references to the pcb layers. You can also use the inhibit keyword in the fzp file to do the same thing leaving the pcb intact if you may want to change your mind later.