Example of permalink taxonomies.

example.php

<?php
add_action( 'init', 'create_model_taxonomy' );

function create_model_taxonomy() {
	register_taxonomy(
		'model',
		'resource', // Might need to change this if the CPT has a different name.
		array(
			'label' => __( 'Tanel\'s Model' ),
			'rewrite' => array( 'slug' => 'model' ),
		)
	);
}
?>