Wordpress Thesis Theme Customizations

** Please do not respond unless you have experience of Thesis theme and are able to provide references to websites where you have customized it *** Our websites use Wordpress MU, Thesis theme, external PHP, widgets and Amazon A-stores. We are looking for a designer to work with us on an ongoing basis on the UI of our sites. Each site requires different levels of customisation and tuning so you must have an indepth knowledge of Thesis 1.6. Preference will be given to candidates with prior experience of using Wordpress MU, using Wordpress as a CMS for pages as welll as blog posts and customization of Amazon a-stores. Please provide references and details of sites you have previously worked on. Please provide do not bid until you have viewed the sites and are happy with the scope of the job.