Is this the idea?
I don't have a NES controller to compare it to, but I've drawn it as best I can from images on the internet. I'm certain that someone here can print off the PDF and tell me if there's any error.
Use the original 4021 for the IC and a graphite pencil to colour in the resistors (a marker or wax crayon will not work).
You may either use the original membrane or new tact switches.
This PDF will print to the actual size if you set page scaling to none.Edit: image moved to external hostEdit: attachment removed, PM if you want the actual boardart.