I thought this was one of my pictures for a minute! I see this stuff all the time.
If the client refuses to perform the necessary work to make this installation safe, I would be compelled to report him to the city inspector. I probably would not make any friends, but I would be content to save a life (or lives) instead.
We see this alot in our line of work, and it becomes almost comical after we callous up to it...but it isn't funny at all. People DO die, and all too often, from this type of neglect, and it's usually an innocent - not the cheapo who is responsible for it.