I looked at that last year and put it in the parking lot. Lack of customisation was the issue. OpenSIS is written for the North American system. In AU we need to show information such as ABN and CRISCO as a mandatory. Then there is the new reporting standards we will be obliged to.
Looking at the ktree.com site it timed out waiting for Moodle info to appear. Personaly I will leave it in the parking lot for a little longer.
John