Migrating From Zentrack

For the last couple of years I have been running Zentrack internally for
my groups ticketing solution. I am currently looking at moving over to
RT in the near future because of some flaws and missing features with
zentrack. Has anybody seen/written any migration scripts to move
between the two packages? Basically I just want to dump my old zentrack
tickets/logs/attachments into zentrack to avoid having to keep the old
ticket system up for archival purposes.

Any help/pointers would be appreciated.