wow, you do have some issues. The chewing, at his age we know it isn't due to teething. I am baffled. I would just make sure he had lots toys and bones (not raw hides) for him to chew on. I knew of a childhood friend who had a giant Schnauzer that would even chew through 2x4's and fencing, so I guess some dogs just chew.
As far peeing issue. Sounds like a toddler thing to me, he is testing his boundaries. Just be very consistent with his punishments for other things, he will eventually get it and behave.
I wish I could be more help, I just don't have direct experience with this. Good Luck