Magento Modules Customization For B2B Sites

We are building B2B site with magento vendor module, edit order module and other product option module. We have reference site. All modules that are needed for B2B site building was installed. and while developing, if we need more built-in module, we will also purchase. So, we don't need to develop this site from beginning..Just customize all the points that we mention with the installed modules.. 1. vendor module customization 1) registeration form minor changing 2) vendor product input form minor changing(product option stock management, prepack, color-size option selection table display 3) the other minor points 2. buyer front page 1) registration form minor changing 2) checkout page customization 3) shopping cart part minor changing 4) the other minor points 3. Sales Rep module customization 1) sales Rep registeration Form creation 2) Sales Rep Management Page - This can be developed with current customer management in magento. 3) the other minor changing. 4. Admin Edit Order module minor customization 1) product image base, etc Urgent Points 1,2 should be done first..the others can be done one by one.. We will give more bonus depending on how fast and effective you can customize.. We will give project fee like this 1st 30%, 2nd 30%, 3rd 40% Thanks for interesting this project.. God bless you.. Thanks..