I am doing the same thing. I actually have modified the SAD2 script to determine the make and model of the machine and use custom driver packs for each machine. I am finishing up the script and testing it on a few more of our models. When I get it complete I can post, along with a howto on the way I have it set up and running. I found that you do not need to have the machine logged into run it, I have it so that in case it reboots during the middle it will even resume the install so that you make sure all the drives get installed.