As far as I know the tabs can only go at the very top above the title and price or down below everything where they are now. IE, attached to before the product summary template block or after it.
For the layout, you can make it full width but not really wrap around the image like that without significantly customizing the whole layout. If that is your only desired result, you'll need to look into a freelance developer to customize the theme files to create that layout as its not something we can help with via support.
The product image and product summary are in two different containers; one container set to "four units" and the other "eight units" so that they combine to take up the full twelve units wide of the layout. Then those get adjusted further when the browser gets changed in size.
So you could make the whole thing full width but the image would just sit on top of the summary and not actually be inside of it like in your demo image.