Wordpress CSS integration?

Please check my site http://pictureaweek.com/forums While punbb is nearly integrated into WP style I am not able to fix following

1. Overall width of the forum and the blog is not same. blog has a fix width of 950px. How do I setup punbb width in "main.tpl"

2. I am using Cobalt style, but need to change the "blue" active link color of the default cobalt css to match blog style.

3. Header/Footer: Header has some speacing while footer is coming correct.

4. Some text is aliged center within the tables e.g. logged in, last visit etc and show recent posts, unanswered posts etc.

Please help me solving these things