[Atsutane]

Well maybe u can imagine like this. Inside your bbpress template, all file (not included header.php and footer.php) equal to your normal WP post. So u need to set up header.php and footer.php to be like ur WP index.php theme file.

To make it short. Cut your WP theme index.php into 3 part. 1 for bbpress header.php, 1 for bbpress footer.php and one for your post a.k.a other bbpress template file.

Sorry if my word confusing you. But i donno how to explain it .