Is it possible to use this to just create a package using 2012 to push out a nightly reboot with a countdown timer, a delay option and a reboot now option? If so can someone get me pointed in the right direction on the script, seeing how there is no install or uninstall.
Yes. The Installation and Uninstallation in the script are just sections. Use Installation. Within that part, remove all Show-* functions that are there currently and add Show-InstallationRestartPrompt with parameters of your choosing.