I like the idea, but why duplicate content? How about a (Community Wiki) post here on JSE Meta with links to good and bad questions on JSE, there are lots of both. Anyone stumbling over a good or bad question could add it to the list, possibly with a comment on why the question is added to the list.
The idea of showing how a bad question can be transformed to a good one is excellent, but again, couldn't we just edit existing questions, and link to the edit history?
Then when someone posts an unclear question, a link to the meta post might help improving the question. There is of course a How to ask a good questionHow to ask a good question-guide, but actual examples are always better.