I'm still working on it as I was too tired last night but have a few codes down
#header, #footer, {
display:none;
}
This removes the header and footer. You can pick just one or the other to remove as well.
#content
{width:650px;}
Adjusts the width of your the boxes.
You can also select the individual boxes by using
#usercollections
#usershop
#userneopets
#usertrophies
I have hardly started working on it yet mind you so who knows what else is possible.
Edit All in style tags I forgot to mention