See this blog post for more details on how to set things up for full effect. Also managed to not require a window decorations. Simply drag the top part to move the window around. Click on home buttons to return to desktop. Add tab buttons create additional windows. And the clock actually works :)
Now I am including the latest zips as they do not seem to crash my Chrome as I had experienced with initial versions of the apps (197381). In any case use at your own risk.