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Welcome to the Bunnings Workshop community @nico1212. It's wonderful to have you join us, and many thanks for your question about constructing roof trusses.
If you can construct the trusses to standards documented in the Building Code of Australia (BCA) and a structural engineer gives a certificate of compliance, then there is a good chance that your building surveyor will sign off on them. Your trusses will be scrutinised more heavily than a prefab alternative that already comes with certification. Even if you use a suitable construction technique in the BCA, the surveyor might still find it unsuitable.
I'd encourage you to speak with your local council to discuss appropriate construction techniques and what type of compliance certification they'll need, but they might direct you back to the BCA. Also, investigate the cost of prefab trusses. You might find they are only marginally more expensive than constructing them once you factor in the price of an engineer certifying your work.
Please let me know if you have any questions.
Mitchell
