Recently applied to council for approval of carport, I designed it using trusses which will be held together by knuckle nail plates. Trusses are 3.2 metres long and 0.5 metres high. Surveyor is telling me that i cannot fabricate my own strusses and have to go to truss manufacturer. Even if a structural engineer has given a certificate of compliance. Brochure for knuckle nail plates says you dont need any special pressing equipment, all thats neeeded is a hammer. Can anyone tell me why we are not allowed to build our own trusses.:~