I could have definitely used this a few weeks ago! Very nice.
replies(2):
Now could someone please fix the BCD store mess?
The current form of it was introduced in Vista.
The same concept existed before, but I know less about how it worked back then.
Even without unattend, something I think people don't realize is that you can install windows on the command line. Diskpart to partition, dism /apply-image to extract files, then bcdboot to install the bootloader.