At this moment original NAT module is in good condition, so there is no reason to duplicate work and thus it is recommended you will use NAT module instead.
Info
NAT-ng comes from NAT module, a helper module used to maintain node-term relationships, i.e. when a node is created a taxonomy term is created automatically using its title and body in any associated vocabularies. This module also attempts to preserve hierarchical relationships where possible.
Installation
Unpack the nat_ng folder and contents in the appropriate modules directory of your Drupal installation. This is probably sites/all/modules/
Enable the NAT-ng module in the administration tools.
If you're not using Drupal's default administrative account, make sure "Administer NAT-ng configuration" is enabled through access control administration.
Visit the NAT-ng settings page and make appropriate configurations
For 6.x: Administer > Site configuration > NAT-ng
For 7.x: Administer > Structure > NAT-ng
Note: You should not use NAT-ng for Free tagging vocabularies.
Upgrading from NAT module
Follow these steps to transfer all settings and data from NAT 6.x-1.2:
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