daily deal site website design and infrastructure

I need a fully functioning daily deal website - groupon as a guide. It needs a deal load up interface like ebay (with less data fields required) and an easy to navigate admin panel that allows the administrator to fix any issue. It needs paypal integration for the payment processing. It needs to have an easy use control panel for vendors to laod their deals and edit them. It needs an easy to use control panel to allow consumers to see what they have bought, and to be able to update their details. Separate severs for data, photos, database backup, and have the site populated/replicated over one main site, and replicated on 8 location specific sites. Thoughts and quotes? use Australian sites such as [login to view URL] and [login to view URL] as a guide. Needs ot be hack proof.