Digital material selling website

I require to design a website wordpress based in which shopping cart will be integrated and products will be word press themes , plugins , website templates . All the products will be categorized and must be linked and developed in the drop down menu . Buyer must be able to view a live preview of theme before he can buy . There must be the registration , login and profile options with the history of buyers transactions and his products he have brought . He must be able to download his bought theme in future also . No one must be able to download any thing without paying . Paypal will be integrated and will be only payment method . The products will be like this . Themes , software , plugins , tools etc and the products will have sub sub products based on categories and templates like falsh website template , html template , shopping website template , online store etc similarly this will apply to all other products . You are required to upload two dumy products in each category for testing purpose later on products will be uploaded by us . The product and inventory management must be simple and gui based including picture and thumbnail management of themes . There must be no limit on products , no limit on users and no limit download after payment . The download must support the idm and other download [login to view URL] will be some free products also . . When buyer downloads free product he must not be redirected to payment gate way and must be able to simply download the theme or file . There will be captcha in user registration , user login and file / theme download . If the user is loged in and register he must be still allowed only to download the theme or file when gone through captcha verification . . If you any query plz feel free to discuss with me . Successful bidder will have to do the work as per the description mentioned in this project . No dispute or question after award of project . If you any doubt or want to clear any thing before bidding please clear it with me .