303047 modify wordpress theme layout

I have a custom wordpress theme (onenews) that displays data in 3 columns per row (and an unlimited # of rows). The problem is that I want to use the entire length of the 3rd column for advertising. Right now if I put a few ads in that are greater in height that the text on the same row, subsequent rows are getting bumped down. Therefore...I want to change the layout so that only the first 2 columns are for feeds or html (as it is now), but make the right column one cell all the way down the page that I can use for banner ads. I have the zip file. Attached are images showing the current problem (layout_bad), how I want it to look (layout_good), and the same thing but outlining the cells for clarification (layout_goodoutline). Re: the project fee, I have no idea what's involved in this. If I'm way off on the price, just bid whatever you think is fair.