The Scala tag wiki on Stack Overflow is rather, well, interesting in this regard - have a look at it. Someone actually wove together almost an entire language tutorial from one question successively to another, then another. That's great for a whole language tag, but it doesn't really allow for the smaller segments of 'chains' that you're talking about.
I'm of the opinion that the tag wiki system doesn't nearly come close to doing everything that it could for us, and this is a really good example of something it could be doing provided that a way to make all of the information easy to discover is devised.
Our usual question format isn't ideal for what you describe, we'd need some sort of special status to give these sort of stubs, which could conceivably be nominated by someone creating them through the tag wiki system.
Note that I'm not saying that we're going to do this, or do it any time soon, it's just another classic example of how they could be doing more for us - and I wanted to get that down. The idea you have has value so long as it doesn't actively encourage folks to try and crowd source entire projects - but I think we can keep that from happening easy enough.
I'm not putting a status on this yet - as really sitting down with the tag wiki system is on my list to do before the end of this year, and this is one more piece of the puzzle that I'd like to find a fit for in a broader / better scheme of things when it comes to them.