I am working on something like what you are suggesting. I currently have only the email container done(Postix/Dovecot) and working on a small cmdline tool that

I am working on something like what you are suggesting. I currently have only the email container done(Postix/Dovecot) and working on a small cmdline tool that will take care of bootstrapping the containers by asking a few simple questions. The point is to make the whole setup as frictionless as possible, by providing a sensible set of standards and only asking for the bare minimum configuration parameters. In the future I plan to expand the tool with a web interface so you can install and uninstall applications from a central repository or a git repository. I will publish what I have soon, just need to build a few more applications containers(think rss reader, owncloud, git repo). It seems like a useful thing to have and I am curious if there is a demand for such a tool.