I customized some CSS stuffs yesterday in an attempt to switch the columns of the content to the left and the widgets to the right to simulate the upcoming skin. I've also made the layout into a fixed-width and altered various elements to accommodate the layout. So far there aren't any major issues with it except for the wiki main page which the right column overlaps part of the content (haven't figure out how to solve that issue) and the very narrow "My Home" page. It's not perfect but it's meant to be a preview anyway.
If anyone wants to try out the repositioned columns and a fixed-width ME wiki, you are free to take the rules from my page User:Teugene/monaco.css and paste it into your own page at Special:MyPage/monaco.css. If you want to remove the customization, just delete everything in the page.