The upper body structure or roof of a passenger car contributes significantly to the total strength of the body of a unit construction vehicle and its removal can seriously affect structural integrity of the original design of the vehicle.

There is no specific regulations under the Road Traffic Act which makes it an offence to remove the roof or upper body structure of a motor vehicle.

However, in the case of passenger cars and passenger car derivatives manufactured on or after 1st January 1969 the removal of a vehicles roof may interfere with the ADR 5A, 5B or 5/100, relating to the upper seat belt anchorages.

Consequently, passenger cars and derivatives manufactured on or after 1st January 1969 will only be acceptable to the Department of Transport if an engineering report prepared by a Chartered Professional Engineer is suppied.

The report must demonstrate that the modified vehicle continues to comply with all applicable ADRs, and that the vehicle meets with the Department of Transport Torsional Rigidity and Beaming Stiffness Test Procedures as outlined in the Engineering Instruction Number 8.

In the case of passenger cars and derivatives maufactured prior to 1st January 1969 no approval or inspection of the modified vehicle is required, however, it is recommended that the services of a Chartered Professional Engineer is engaged to ensure that the integrity of the vehicle has not been degraded.

Convertibles
The upper body structure or roof of a passenger car contributes significantly to the total strength of the body of a unit construction vehicle and its removal can seriously affect structural integrity of the original design of the vehicle.
There are no specific Regulations under the Road Traffic Act that makes it an offence to remove the roof or upper body structure of a motor vehicle. However, in the case of passenger cars and passenger car derivatives manufactured on or after 1st January 1969 the removal of a vehicles roof may interfere with the ADR 5A, 5B or 5/00, relating to the upper seat belt anchorages.
Consequently, passenger cars and derivatives manufactured on or after 1st January 1969 will only be acceptable to Transport SA if an engineering report prepared by a Chartered Professional Engineer is supplied.
The report must demonstrate that the modified vehicle continues to comply with all applicable ADRs, and that the vehicle meets with Transport SA Torsional Rigidity and Beaming Stiffness Test Procedures as outlined in Engineering Instruction Number 8.
In the case of passenger cars and derivatives manufactured prior to 1st January 1969 no approval or inspection of the modified vehicle is required, however, it is recommended that the services of a Chartered Professional Engineer are engaged to ensure that the integrity of the vehicle has not been compromised.

Well I asked a person today

They said: When it gets to Regency, it will get Defected for the roof chop no matter what. And it will cost just under a thousand dollars to get it cleared.