SEO and Layout Modification on Oscommerce Based Stores

I have 12 oscommerce stores that share one database and one admin. Our goal is to be able to make changes in the admin that effect each one of our stores. These changes will affect page title, meta tags and other related features. We want to be able to make each site as unique as possible from the other sites seeing they share the same database. We do not want each title for the same product to be the same in each store, nor do we want the content or meta tags to be exactly the same. There are also minor layout issues that need to be fixed such as a column, table or box being adjusted so it lines up and looks nice. These changes will probably take 10 - 15 hours of work depending on your skill level. We are looking for a long term relationship and have many many more projects to follow. Please no bids with less than a few years of experience and oscommerce knowledge is a must.