Cogzidel RBS freelance site customization

We need someone to modify/improve/customize our freelance site: The script used and already installed is Cogzidel RBS script, which means you need to be familiar with it, if not please don’t bid. The adjustments we need: 1) The script is already installed and we want to customize it: adjust its colors, add some banners correct some badly designed interfaces and spelling mistakes. 3) The site must be very user friendly; several site items must be changed like buttons etc. 4) Ability to add or adjust pages/images/content/text/banners in admin panel 5) buyer/provider must be able to login at both accounts with 1 username 6) install RBS Payment Module add on (google check out, moneybookers). 8) content adjustment: Some labels and text must be changed. We will provide you with the contents to change. 9) 100 % bug free! Money will be released only when the site is fully tested and operating in a professional way. We are looking for an experienced long term partner who can maintain our site and do the necessary upgrades; we have many ideas to implement in the future.