Someone may have already posted this, but here is the laws on Motorised Bicycles in Queensland:
Rules for motorised bicycles
A motorised bicycle is a bicycle to which an electric motor is attached. The motor must not be capable of generating more than 200 watts of power. It is illegal to ride a bicycle on roads or road-related areas (such as paths) if the bicycle has an internal combustion engine (for example, a petrol or diesel motor) attached or an electric motor which is capable of generating more than 200 watts.
Motorised bicycles are required to adhere to the same road rules as bicycles and have the same rights and responsibilities. Motorised bicycles are exempt from registration and compulsory third party insurance.
A two-wheeled vehicle with an internal combustion engine, or an electric motor capable of generating over 200 watts, must comply with the
Australian Design Rules* requirements for a motorbike if it is to be ridden on roads or road-related areas.
When riding a motorised bicycle you must:
* wear an approved bicycle helmet securely fitted and fastened.
The motorised bicycle must have:
* a bell or horn
* at least one effective brake.
When riding at night you must display:
* a white light at the front, visible for 200 m
* a red light at the back, visible for 200 m
* a red reflector at the back, visible for 50 m.
You can ride a motorised bicycle on all roads and paths, except where bicycles are specifically excluded.
You do not need to have a driver licence to ride a motorised bicycle.
For information on registering a motorised wheelchair visit the motorised wheelchairs section.
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Last updated: 24 May 2010
This came from
http://www.tmr.qld.gov.au/Registration/Registering-vehicles/Wheelchairs-and-small-devices/Motorised-foot-scooters-and-motorised-bicycles.aspx
I wanted to look at design requirements for a motorbike but I would still be reading in a fortnight, therefore I think it's safe to assume that they would simply want you to make sure that everything is secure, i.e everything that can has a lock nut of some sort, and that everything is able to take sudden impacts -I know mine can.