I made some heavy modifications to the plugin in order to have it work. As of right now the plugin requires ngg custom fields or the magic in the xml dir doesn't happen. It didn't happen with it though either.
There were a few "<?" missing the 'php' to be complete like: "<?php". You have to have, magic quotes i think, in order for that type of syntax to work which is not recommended.
There were a bunch of other things as well, and I'm not trying to critique you by any means. I would like to get with you via email or something when you get a chance and I can send you my changes. My biggest problem was getting the imageURL to work, and it required two foreach loops in the end.
Anyways, hit me up. agentc0re at learnix dot net