I have several sites that are marketplace type website where people can post up products, receive messages, choose plans...the websites have customer content management systems and companies can also manage their store front...etc...I would provide you the source code access (ftp) and you would change everywhere that needs to be changes and apply a new design.
The desired outcome would be to take the code from a site..duplicate it using a new design. I would have someone else do the designs.
a) take the source code of website 1 and apply it to a new design to create website 2.
b) expert must have experience with websites that have custom content management systems(CMS)
c) database expert since we have websites where people can sign up and post items etc.
This would be a test and if successful then I would continue with future projects or hire.