I have read your project description, and checked your original website (which unfortunately doesn't work - could you let me see it somehow?), i understand what you want, and i would like to offer you my services. I have excellent knowledge of Prestashop and related technologies, plenty of experience with them, most importantly including creating Prestashop themes, so i can easily make you new theme for Prestashop 1.5 form your old theme for Prestashop 1.1 quickly and without errors. Feel free to contact me by private message to discuss the details. I'm looking forward to our cooperation.