how easy can it be?

Hey guys I finally decided to lose drupal and use punBB all the way

Ok but before I can I need some suggestions.

First off this is the layout for our new version:
http://img301.imageshack.us/img301/5460/avv235am.jpg

As you can see I want users to login from the site as the same loging in to the forums, basically what I want is to have some user settings on the site based on the punBB DB. Which means if the user logs in on the site he/she is already loged in on the forum but on the site he/she will have additional features and when they look at the forum they will see those features gone or w/e.

So anyhthing you guys can help me do? maybe a tutorial somewhere that will help me? anything will be great.

Hope you guys understand and comment.

-Danny