Overall I think it is pretty decent, simple and clean. I do not have time to give a full review but just from a quick look and from an seo perspective I would suggest trying to consolidate some of those forums. You will have a very hard time populating all of them. Try to stay on your main topic as well as much as possible.
Shorten some of those forum descriptions! They should be maybe 150 characters or so. Less even.
Another thing, not seo related. Change your favicon from the default vbulletin one, try to use progressive jpg images when possible for your forum images.
Good luck!