Wow I am the first to comment! I really love these WordPress "specialised mini frameworks". They enable me to learn and enhance without bloat. With apologies in advance if this sounds ridiculous, it would be great if the metaboxes/fields could be exposed to the Customizer via the Customize Posts plugin. In reference to the post about WordPress and innovation - what enables innovation is the combining of disparate technologies to generate heretofore unavailable functions and features. Accessing the output of this plugin in the Customizer would be a quantum leap for WordPress.