The problem you are running into is that the sidebars cannot go the full height. The only way I can think of (and I haven't tested) is to:
- Start with Right Outer and Left Outer sidebars turned on
- Create a 3 celled widget area in ATO>Style & edit HEADER AREA>Configure Header Area and take everything but the widget code out of that box.
- Now go the WP>Appearance>Widgets and look for the middle widget area of the three you just created and put a 2 cell widget area in there for you featured slideshows and youtube vids. Also put a 1 cell widget area under the 2 cell widget area for your menus and social icons
- Now you will have 6 new widget areas in which you will put a slider widget, youtube vid widget, menu widget, cat widget, and ads.
The widths of the 2 outer cells of the 3 celled widget area will need match up with the width of the Right and Left outer sidebars.
Here is a screen shot
that gives you an "idea" of what I am talking about as this is a rather complex layout.
This whole thing wold be a lot easier if you didn't try to go full height on the sidebars.
As you can see this is the kind of stuff that's pretty hard to describe clearly. But if you want to proceed I would get real familiar with "New Widget Areas"