This is an example of a minimum plugin that is a total conversion of Naev. In particular, plugin.xml uses the <total_conversion/> node to signal to the engine that the core data should be mainly disabled.
This plugin is not intended to be truly playable. It just shows how to create a small universe with a single system and spob in which the player can fly around and do things. It can be used as a starting point for creating something significantly more interesting.
For Naev development, please refer to the Naev Development Manual for more details.