Thanks for using my plugin. I’m not a TwentyFourteen expert by any stretch (I’ve never even activated it to be honest), but I believe if you remove line 49 of that pastebin, that will handle the removal of the sidebar. As for removing the header and footer, that’s probably easier achieved through CSS as you can simply set the surrounding div’s to display:none;. I do not recommend removing lines 20 or 52 as that will most assuredly break many, if not all of the, things on your site.
I can’t give you the exact CSS as I’m unable get the host IP to resolve.