Custom Post Type Templates

I want to create a template within my plugin which will display the entry in a certain way.

I’ve added the template no problem:

add_filter('single_template', 'mjt_class_single_templates');
add_filter('archive_template', 'mjt_class_archive_templates');

however within the template I still want to inherit the theme settings to some extent.

So within my template file I need something like this:

get_header();

while (have_posts() ): the_post();

   <!-- inherit stuff from the theme to open the entry-->
   <!-- do my own formatting of title -->
    the_title();
   <!-- do my own formatting of content -->
    the_content();
   <!-- inherit stuff from the theme to close the entry-->
endwhile;
get_footer();

I have a feeling I need to do something with get_template_part but … I can’t work out what.

Any help much appreciated everyone.