I need to set up a new multi-site, multi-org Drupal 7/CiviCRM 4 installation on a new server. One parent organization with three children. The child sites need their own front end, and all will access same CiviCRM database, with group permissions controlled by which front end site they have logged into. Child A site only sees Child A contacts, Child B site only sees Child B contacts, while Parent can see all Child site contacts. I do not need any content or other help with Drupal or CiviCRM, I just need the initial configuration with the permissions set up and working.
Please do not bid if you haven't a) already done this for someone you can provide as a reference or b) show me a site you have configured on a test server of your own. If you know CiviCRM and you have done this before you know it won't take that long if you have all the information to plug in (which you will have).
Thanks in advance for your consideration.