High lead levels in the 70's and '80's were caused by Lead in the Gasoline. Not fucking paint chips. They used to sell lead toys in the 80's for fuck sake. Vaporized lead is bad, solid lead is relatively harmless.
Given time I can disassemble anything. Been breaking shit my whole life.
My thing with the wall is where did it come from? This isn't some hastily thrown together structure. You can't build something backwards and make it fit together right. This wall was designed months ago to keep people in. Not out.