Hi,
I'm Prestashop designer with 7 years of experience, and I already made some beautiful designs, just check my portfolio !
As I said in my profile, I can made some specialized tasks about web performance, module development, but I also offer services for upgrade Prestashop version.
My best assets are CSS, HTML, jQuery, PHP, and some technologies for display functionality or some more specific about ecommerce.
The main difficulties is about from who and how are made your modules, the upgrade could take time depending that.
If you select me, this will be my first mission, and you will make a design that will fit perfectly with your request (or may be more), even if that make more time.
Feel free to contact me to discuss the mission (I speek french and English).
Regards.