Add three boxs below the “popular places” section

Hi,

In the homepage I need to add news stories from our partner/sister site, our latest tweets and latest youtube videos. They should be in boxes, horizontally next to each other below the popular places section.

How can i achieve that in a responsive way? I noticed the hompage is called/built with catch-katmand-functions.php. Should i create a function that gets called after the function that builds the hompage finishs executing? I cant seem to find a plugin that fits right into the scenario.

The page I need help with: [log in to see the link]