If your vehicle has had any bodywork repairs, the paint and/or underseal would probably need to be stripped and inspected by inspectors in New Zealand, to determine whether it complies with New Zealand requirements. Just because a vehicle will pass the British MOT inspection, is NO guarantee that it will pass the 6-monthly WoF - Warrant of Fitness inspection.
Any "significant" modifications to the vehicle, will have to be inspected, and if acceptable then certified and plated before a WoF inspection can be conducted. Keep in mind that New Zealand authorities will probably be unfamiliar with the factory-standard specifications of these Brazilian-built vehicles. I'm not sure how they would feel about having the passenger sliding door on the offside and/or the steering wheel on the nearside!?!
There is a lot of information available about such things on official websites in New Zealand, but I cannot recall which ones for the moment.
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Regards.
Nigel A. Skeet
Onetime member, technical editor & magazine editor of the Volkswagen Type 2 Owners' Club