WHY
Why do you feel the need to mess up a perfectly good sidebar? Why are you moving notifications, friends, and messages to the bottom of the sidebar? What's wrong with leaving them where they were? Why do you hate leaving perfectly acceptable UIs alone? If you want to change the UI, ADD A TOGGLE
That way, if someone would like to use the new UI, they can toggle it on. If they don't like it, they're not forced to use it.