Integrating WordPress with PhpBB

Hello!

I run this website: http://www.paparizouforum.com, and we have also got a phpbb forum, http://www.paparizouforum.com/boards. Our dream is to integrate those too, for our new design which is not available yet.

This is what we dream:
1. We need our users to log-in/register both at wordpress & phpbb with one account, the phpbb one. That means all in one registration, but no access to their wp user control panel (if there is any).
We already have 1326 members registered in the forum, so we need their accounts to be active when we integrate those 2.

2. We want those members to be able to post their own stories/posts in a specific section on the forum, without going to user control panel, but directly in a form they will find.

3. This one sounds tricky, but it will be great if we could achieve it somehow. We want our members to post comments (always with their phpbb accounts) under the wordpress posts, but those comments should appear as posts in specific topics (which we will choose) on the forum!

I know I am asking for many things, but I am really willing to try any solution you suggest, even if it takes many plug-ins or code-work 🙂

Thanks in advance, Panagiotis!