Within a setup that large, typically I think customer would want to install and control the OS themselves. They have no idea how patched the OS will be for example when it arrives, what about SQL CALs? Windows CALs? What if you are deploying it as a Windows 2008 and the customer says we only use Windows 2008 R2? What about their anti-virus, firewall, local lock downs, backdoor emergency admin accounts?
If you want to ease installation/deployment for the customer off up an installation service for them either on site (big $$$ for them) or remote (cheaper $) using remote access software. You'll likely save yourself a big headache.
If the software is simple enough to only need a single server + SQL server on it, then it should be straight forward enough for an admin with the PDF to install it and then the bigger guys with dedicated DBA's can set it up on their SQL cluster, with the mirroring, and all the built in stuff they'll have customized for their own network.