creating a 10.5 image problems

I am trying to use instadmg / instaUp2Date (1.6rc1 rev 309) to create my first images. I tried making a 10.5.8 image using a retail 10.5 disk and the 10.5 vanilla catalog (adding the createuser.pkg) to it. The resultant image does not boot. The machine that I created it on is a 10.6.4 machine. After trolling the forum, it looks like the problem might be because I created it on a 10.6 machine, so I copied the entire instadmg folder to a 10.5.8 machine and when I run the instaUp2Date command I get: 22:31:16 ###### InstaDMG build initiated ###### InstaDMG version 1.6rc1 (svn revision: 309) Host OS: Mac OS X 10.5.8 Host Hardware: MacPro3,1 Output file name: 10.5.8 Vanilla Output disk name: KCPA10-5-8 22:31:17 ###### Finding main MacOS X installer disk ###### Found primary OS installer disk: ./InstallerFiles/BaseOS/Mac OS X Install DVD.dmg 22:31:17 ###### Looking for a Cached Image ###### Mounting the shadow file (/private/tmp/InstaDMG_temp_folder.agg2Vy/9FAA2902-6E3C-4DA2-B500-7BDB618D6033.shadowfile) onto the cached image (./Caches/BaseImageCache/E556BB16.dmg) Target OS: Mac OS X 10.5 (9A581) Encasing installer daemon in a chroot jail Chrooting com.apple.installdb.system daemon 22:31:22 ###### Beginning Update Installs from /tmp/InstaUp2DateFolder-JqCAtk ###### Working on folder 01 Mac OS X 10.5.8 Combo Update (22:31:22) Mounting the package dmg: MacOSXUpdCombo10.5.8 sha1-0a88c9ecfbe08faf1a2307929c67f38b4822dfcb.dmg (/tmp/InstaUp2DateFolder-JqCAtk/01 Mac OS X 10.5.8 Combo Update) at: /private/tmp/InstaDMG_temp_folder.agg2Vy/mount_point.CFjHDl/private/tmp/mount_point.oXxnM4 ###### There were no items to install in: /private/tmp/InstaDMG_temp_folder.agg2Vy/mount_point.CFjHDl/private/tmp/mount_point.oXxnM4 ###### 22:31:23 ###### Cleaning up ###### Restoring normal installd daemon Restoring com.apple.installdb.system daemon Ejecting images ###### Internal error: tried to eject an image from /private/tmp/InstaDMG_temp_folder.agg2Vy/mount_point.CFjHDl/private/tmp/mount_point.oXxnM4 but that path is not a directory ###### Deleting scratch DMG So, how can I create a bootable image of 10.5.8? Thanks -Gary