Server Imaging with InstaDMG

Not having a lot of initial luck with this. First off I tried renaming my install disk DMG from "Mac OS X Server Install Disc.dmg" to "Mac OS X Install DVD.dmg" (as required by the script), then i tried editing the script to accept the original name. both times the result is incomplete. the image cache it creates is way too small (186M compared to the succesfull client imagecaches always over a GB. mostly due to design app installs, but still that's way too small - should be at least 1GB right?) when i naively mount the asr-ready image the applications in the /applications folder are generic and of course when i restore the image (using bombinch NBR) i get a useless disk, flashing folder, no system found. am i missing some initial step? or have i just imagined that people are using instadmg for server imaging?