Hello, i have read your project description, i understand what you want, and i would like to offer you my services. I have worked on similar projects before (Joomla/Virtuemart upgrades) and i have years of experience with all required technologies (Joomla, Joomla extension development, maintenance, upgrades; PHP&MySQL, HTML&CSS, JavaScript, jQuery, MooTools), so i can finish this project quickly, without unnecessary errors and to your full satisfaction. I have also development server, where i can present the upgrade if needed. In case you would like to discuss the project with me or get started, feel free to contact me by private message. I'm looking forward to our cooperation.