Alex writes “There was a Videopac 7400 with a broken power switch in the attic. Next to it was a NES which only life sign was a blinking power led and blinking screen. These would be my two victims: I would try to fit the Videopac inside the NES-case. Not hindered by any technical skills whatsoever and with a newly acquired dremel-clone, I made a start.” Link.
HOW TO – NES to Videopac7400 mod