I've seen and even worked with some examples of this approach earlier. It works well when you have definitive templates that all the content would fit but you return to the step 1 when you need a flexible white box for the user to fill.

There's actually a way to just include arbitrary HTML (but it's not shown in the quick initial demo).

If you put your email in at the end you get access to a full demo that shows you all the features of the full CMS. Thanks for checking it out!