Some main page changes?!?!

hello everyone,

heres a plan to change the main page , when user login appears.. I just want to change these..

*  a Join now button.. with "features in site" box. 

* Login box is replaced by slide login plugin.

* A space for notifications/ads/news.. etc.

** The logo must be in the same place..

**Footers are in the same place.. 

How will these look like?

post your comments and the edited file here..