ZenCart - 3rd party Sellers CMS / Partly Done

I have work that needs to be done fast. Complete ZenCart which is set and working and i need to bring 3rd party sellers. Their registration and management in ZC admin is almost fully done. Sellers login part is also working. Their CMS which is outside of ZC and HTML / CSS files are done. I need to start adding functions for sellers (make it all work) * Add / edit products - including 1 product option which they can name * Ability to add shipping charges according predefined regions (UK, EU, Asia, USA, etc) * Payment system via Paypal from Admin to Sellers * Section to see Sellers orders and allow to update the order status * Section to show sellers earnings / sales * Statistics - breakdown of sales / finances * Section to edit their profile details * email alert system ------------------------------------------------------------------------------------------------- One difficult part is to allow customers to purchase products from different sellers in the same time. In this case there should be one checkout / payment made but order would split into the number of sellers involved in the order. REQUIREMENTS: * fast delivery and updates at least 1-2 days * good knowledge of ZenCart and strong knowledge of PHP * budgets up to 350$