A blog on New Zealand Civil
Looking up the inside of a hopper, maybe the hopper of a Fletcher?
Not even close there Sir Minty.
Looks like it will be an old aircraft.
Well there is old, and then there is olde.This one fits in the hippie sixties onward bracket.So I would say from your ZK-CIB callsign [presumably CIB/3]that it would be fairly modern.
It looks like an F27 tailpipe and at a guess ZK-BXH at the ANZ Engineering Hangar although the sky is a problem. Or I may be miles away from the answer.Cheers Barry