Instadmg & snow leopard — Only OS is installing

Folks, I'm having some issues here with Snow Leopard, the Base OS is installing fine... But any other catalogues are failing... The OS component is being installed, but the other software is dying during install. instadmg.bash: line 786: 25105 Bad System Call /usr/sbin/chroot . /usr/sbin/install -verbose -dumplog -pkg "$CHROOT_TARGET/$TARGET_FILE_NAME" -target / or installer: Error Trying to locate volume at / Any suggestions? And can Snow Leopard images be built on a system running 10.5? What's the rules for building instaDmg images?