For the most part it's ASIC registration for the trustee company every year (about $400) and accounting fees for the trust (about another $400).
Ongoing costs are essentially the same as discressionary trusts, or even a pty ltd company. Setup tends to be a little more expensive than the more common trusts.
With any sort of trust, most lenders will charge you a 'vetting fee' the first time they see that trust deed. It's about $300.