Not bad at all, very smooth and nicely laid out as far as design in the forum. Although I'd work a bit on the header

Your image gallery has some neat pics, i'm sure that will attract people. Might want to get a few people to post within the forums and stuff or consider paid posting just to be able to have more posts in forums since you have quite a bit and that may throw people off, unless they see a fair amount of content within each.