Windows Update w/machines not on network

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http://serverfault.com – We have a scenario where we have 60 computers that need to be loaded with Windows7 at our company as well as have all windows updates installed. Our company has an internet especially for visitors and since these computers are for a client the contract states they are never to be connected to our own companys network. Therefore, they must be installed on the visitor side of our network. The problem is we will have to install our own hubs (can't use switches as they would take the other switches down) to install the updates onto multiple computers at once. If we do this it would take around (HowTos)