Prestashop products need extra description field

Hi we have a new Prestashop 1.5.4 installation We need an extra field added in front, with an extra description, must also be able to contain images and be easy to edit from backend. Plz look attached front end mock up. This prestashop installation gets products from external Api by cron job, every night. This means all product data is updated every night. Important thing... This new field must not reset with the nightly product update. We are looking for a lasting business relationship with skilled Prestashop developer