Converting Twenty Fourteen Primary Sidebar to Content Sidebar

Hi Everyone,

Working off a fresh Twenty Fourteen child theme, I have been trying to convert the Primary sidebar on the left (which extends from top to bottom of the home page) to the same height as the right content sidebar (which starts below the featured content and continues to the bottom).

In other words, I am trying to duplicate the right hand content sidebar and put another one exactly like it on the left side of the page (which starts below the featured content area), instead of the current primary sidebar. Any help with the CSS or php code edit locations would be much appreciated! Thanks in advance.