bbPress.org

0.9 is very trim, 1.0 is technically as large as WP

Using topic meta you can store attributes for just about anything.

Searching it is another matter, you’d have to write some custom routines.

It all comes down to how much PHP you know or if you can pay a developer.

bbPress can do a great deal, but sometimes there are apps that can do better, don’t try to hammer a square peg into a round hole.