Well, I ended up just trying Xtreme 5.3D and the 0800 disk method. Everything appeared to be going fine, until I opened up Xbox backup Creator, the Start Button is grayed out. I've selected the MS25 as the drive to use, and it reports the game oddly as:
Media Type: DVD-ROM
Bytes Used: 4.00 TB (4,398,046,511,104 bytes)
And the Start is grayed out. It seems a number of people have had this problem online, but no resolution in any of those threads. I tried both the latest VIA drivers for my SATA card (5.2 from 2007 in the latest VIA package), which recognize the drive fine with a hotplug but have this issue, and the drivers that came with my card (5.1 from 2004) which locked up the computer during hotplug or boot. The card is a Rosewill RC-212 from newegg.
It happens in Xbox Backup Creator 2.6 and 2.5. If I go to "Drive Tools" and choose "Security Sector" it reads and identifies the disk fine, then the start button becomes active. However that unlocks the disk, and when I try to read I get an error about the video files because the disk is unlocked.