change

Introduction
At the moment, there is a static website at foobar.example.com. I want to use Drupal (multi-site) to build a new site at this domain. But until it is finished, the static website shall stay.

Is it possible?
Can I create a multi-site at foobar2.example.com, build the site, and later rename the folder inside of sites from foobar2.example.com to foobar.example.com and change $base_url inside of the settings.php to the new domain? Anything else?

I'd like to be able to submit a post, have members vote on it, and then if the score is high enough, it gets published publicly. Is that possible? Perhaps if I posted a private group post, it could be changed to public with og_audience?. Should I be looking at the action module instead?