How to show custom post type, single post, by shortcode in a page??

Hi there

I have a problem. I have found some solutions to create a shortcode to get a single post from a custom post type, but it only calls whats in the original editor-field in every post or page in wordpress. It does not call what is in my custom fields. I suspect that it cannot read from the template file, so i tried combining some get_template_part into, but with no luck.

Does anyone know what to add to make it display it all?

function cpt_content_func($atts){
    $post = '';
    $content = '';
    extract( shortcode_atts( array(
        'slug' => null,
    ), $atts ) );
    $args = array(
        'name' => $slug,
        'post_type' => 'rejser',
        'numberposts' => 1
    );
    $post = get_posts( $args );
    if ( !empty( $post ) ) {
        $content = $post[0]->post_content;
    }
    return $content;
}
add_shortcode('rejse','cpt_content_func');

I have a php file called 'content-rejse.php' with the html design where it calls from the custom fields, and it works if i show all my post, and a single post, but not when i try to retrieve it with my shortcode, then it only show whats in the original editor-field.

Thank you very much in advance, i hope you can help me.

Best regards Nikolaj