Pull posts from the whole network on magazine theme?

Hi,

I have fallen in love with a news magazine theme on Themeforest, and really want to use on the mainsite of my multisite, and then make it pull the posts from the whole network, and not the mainsites posts. Of course only on the homepage, and then make the posts link to the blog post.

Is that possible?
The front page i want is like this: http://themeforest.net/item/the-voux-a-comprehensive-magazine-theme/full_screen_preview/11400130