By pure serendipity, I visited the Ashburton museum today. A small sign on highway 1 caught my attention so I turned off and spent a good amount of time wandering around the museum.
I can confirm that ZK-AMY is being kept in a superbly clean and totally weatherproof hangar. She is just waiting for rich sponsor to come along and be put back in the air.
The rest of the collection is also kept in the same condition and environment. In contrast to too many other museums, they are not roped off and you are positively encouraged to get up close.
I'd recommend it to anyone visiting the area.
Perhaps a bigger sign on the highway would be the only improvement needed.
Many thanks to the friendly staff who showed me around