FYI all... the DISM command line I specified above __works__ for installing .Net 3.5.1 from a specified local source _without_ having to go to the Internet at all (as opposed to the original PowerShell-based approach).
What this means is that for a fully-offline SP2013 install on Win2012, you don't necessarily need to stage your Win2012 servers with .Net Framework in advance - if you don't mind a couple of reboots while AutoSPInstaller is running (which of course it will, after each reboot, automatically pick up where it left off). I will include the change from Install-WindowsFeature to DISM in the next release, as well as guidance within AutoSPInstallerFolderStructure.txt about where to put the \sxs files.
Brian
What this means is that for a fully-offline SP2013 install on Win2012, you don't necessarily need to stage your Win2012 servers with .Net Framework in advance - if you don't mind a couple of reboots while AutoSPInstaller is running (which of course it will, after each reboot, automatically pick up where it left off). I will include the change from Install-WindowsFeature to DISM in the next release, as well as guidance within AutoSPInstallerFolderStructure.txt about where to put the \sxs files.
Brian