Hi EmmaBlueprint.,

If you need the Post Options of the default blog post to your CPT documents then please refer the code wp-content/themes/humanity/framework/theme_metaboxes/

We have used CPT Portfolio and you can check the code wp-content/plugins/designthemes-core-features/custom-post-types/dt-portfolio-post-type.php for how we have used the metaboxes. Hope it will help you.