In article , says...
The issue with length of time is to do with taxes ,if you have owned the
glider for a year then the
glider is "personal baggage" and not taxable.Even if the IRD deem tax is
payable (12.5%)
When the glider is re-exported this can be claimed back.
Re export is simple paperwork exercise,
The issue with experimental is to do with service records and history
acceptable to the
Civil Aviation authorities to allow your glider to fly in NZ.
Since you are going to the Omarama area I would email one of the operations
there and
get there input as they have some experience with exactly what you are
proposing.

www.GlideOmarama.com

Can I put in my two cents for the Omarama Gliding Club also.
www.omarama.com (email contacts on the temp www. page)

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Duncan