In-depth practice session or Lab practice?

I really hope that Treehouse eventually builds in some practice sessions for us to practice the skills we're learning. Something like a lab session you might have in school.

To that end, does Treehouse eventually offer that kind of practice the further you get into the courses/tracks? Or does it stay the same: "follow along and watch, type along if you want" kind of thing. This is the "illusion of learning" as Barbara Oakley terms it in her mooc, Learning How to Learn.

That is not sufficient to ingrain learning. We need to challenge ourselves by sitting down with a real mockup and building the website using the skills we're learning at an appropriate level and pace.

My Question: Does anyone know of any practice sites on the web where just this sort of thing exists? With simple mockup designs that are created to facilitate learning while students build out the mockup/website?

Thank you very much in advance for your time and consideration. I really hope I get some replies.