Hi, I know exactly what you're going through! I have two nine month old pups, that I've had since they were seven weeks old LOL. Your baby is doing what puppies do; he's playing a game. That's all puppies do, really....play, Play, PLAY!!!
Taking away his toys is not going to help; it's going to make your problem worse. Without toys to entertain him, he's going to get into trouble.
I liked the suggestion of training with him when your clothes are drying. My pups would do the same thing with clothes on a line LOL.
I really do not like the idea of leaving a puppy out side alone all day....He should really be in a puppy proofed room, with his toys, bed, etc, when you aren't home with him.
Tieing him up is not going to fix anything. It'll only turn him into a barker, he'll keep digging up any part of your lawn he can reach, and puppies are far too energetic and playful to be kept on a chain.
If you have the time and patience for this baby, keep at it; you will never regret it! If not, re-homing him might be best for him. As his owner, it's up to you to make the decisions that will be best for him.
Looking forward to hearing more about your baby!!!!
~Purr