Just want to give you a head's up on this. When you make this type of tweak, due to the column widths being different than any column width in Ning's theme architecture, it's a domino effect. You will probably need to tweak just about every module on your home page. Been there, done that - - it's a job. At least, this has been my experience. I'd love to hear back, what you encounter and how it works out for you.
And on Linkin-park, you'd be hard pressed to find a Ning site with "more" customization than this site. Great customization I must say, but a lot of it.