[chrishajer]

Best place to start:

https://bbpress.org/forums/tags/integration

You will be copying the WordPress styles and using them in your bbPress theme to approximate the look of your WordPress site in bbPress.

Some people have also put bbPress in a iFrame inside a WordPress page (which I think is a horrible solution):

https://bbpress.org/forums/topic/easy-way-to-integrate-bbpress-wordpress-themes