Unfortunately not. Matthias removed the demo that was shipped with FeinCMS because it was hopelessly outdated and he hasn't gotten around to create a new one.
There is however the
feincms.org website, which is open source. The code is on
Github. It has most of the main features such as the page tree, the blog module and an application content built in. Check out the
models.py file to see how the configuration works.