Create/adapt current theme (customized Omega subtheme) for mobile devices

We have a website in Drupal 7, design is a sub-theme of Omega Responsive theme. We want this adapted for smartphones and tablets. No change in design just making existing theme user friendly for mobile devices. For instance, the headers (images) will be replaced with smaller ones, navigation buttons will be place differently for smartphones and be larger so they are easier to use. Must know Omega Responsive theme and Drupal 7! We will provide files and you work locally or on your sever and then deliver the css files to us after we have approved the work. We provide some new graphics files for the smaller headers, etc. We want someone to ADAPT the existing theme for mobile devices only!