Attributes of Zen Cart need to be changed. PHP / My SQL Required

This is not task for the administrator. MySQL / PHP knowledge and codding skills required. CODERS' OFFERS PREFERRED! If you represent yourself as company, please provide the copy of your business registration and do not send copy/pasted links to non-working websites. SCOPE OF THE PROJECT: #1. Allow Attributes to be in %. #2. Redo screens: admin attribute control, item page & checkout. MOCs of admin and item page/checkout screens will be provided. Please clearlt specify how many days do you need and how many hours per day you are planning to work.