You could certainly restyle the ClassiPress theme to match that of your homepage theme as there is no encryption which would prevent you from making the necessary layout changes. We don't officially support third party plugins, so cannot guarantee that the plugin itself will definitely be compatible with the theme though. We recommend the use of a
child theme so that you don't lose all of your modifications in the process of an update. Whilst we don't offer customization services, we do have a
certified partners page where you can find developer for hire who are experienced at working with our themes. If you make contact directly with an outline of your requirements, they can provide a quote for the work. Thanks.