Thanks. Yeah, that's really what I'm after is removing the extra markup required to make floated layouts like this work, e.g., negative margins, clearing, etc. But, that said, after playing around with it a bit, I'm not even sure I can use display table in combination with inline-block for the items. The problem will arise when the browser is scaled down and I want to say bump the sidebar content down below the gallery images. It seems from searching that when you're using display table, that you cannot make one column (in this case the sidebar) drop down below another column.
So in that case, I may just have to take a look at flexbox and either not worry about IE's lack of support (I'm not worried about older browsers really) or just try to use the backup method you suggested. Since I'm not doing anything ground breaking with this layout, my hope would be if I used flexbox that IE would render it correctly, but I'd have to test it.
Thanks. I'll give that a try