Hello.. :)
I'll be very glad to be the winner of this project, and I'm doing it for FREE, you're one of the first clients I'm dealing with, and that's a pleasure :)
I understand that you mainly want 3-4 new totally different designs for your website, including modifications in the website's layout, and content formatting. You mentioned nothing about new graphical contents, so I understand that I'll reuse the already existing elements (logo, icons, banner..).
I've pretty good experience in this task definitely, watching professionals and learning with them. But yet I don't have a current portfolio with existing examples of my work, you'll be one of the first to be :), I'm sure I'm talented AND knowledgeable enough to cover the lack in experience you may fear, and again, it's all with NO COST at all, I'm offering it just because I'm still building up my portfolio.
Needed skills in CSS, HTML, Javascript, and JQuery are all available in me :) :). I'll be very grateful if you allowed me to have the chance to get the job done. Thanks in advance.