hopefully without too much criticism
Criticism (in the sense of nasty comments) is not allowed here, and we are determined to stamp it out, so feel confident that we won't allow it.
In terms of changing the layout, the first thing to be considering is why you want to change the layout, and how you want to organize things. If you are having more than one column, what is the purpose of a second one? Is it a sidebar? If so, what goes in it?
So make sure you are very clear at first about the rationals for columns. Honestly, often one column is better, simpler, and easier to understand.
So make sure to plan this out carefully first, perhaps on paper, and draw up an exact picture of what you need. Then we can propose a simple way to do the layout.