Bill I understand your enthusiasm for a turbo/6 and I have no problems with it. It just didn't answer the op question except about the rust issues. And how to improve his /6 cheaply to make it a good all around driver.
But in most cases when you read about junkyard turbos they need to be rebuilt and it isn't cheap to do. Also here where I am at finding a turbo is hard to do. I like the pictures you posted and seems to well thought out but dollar for dollar that turbo /6 was not cheap to build.
Back to the op question.