First of all, I would seriously recommend using the latest bootstrap 3 for responsive websites. You might as well since you're already using their 2.3 version. Bootstrap 3 was made for mobile first and makes it so much easier to develop for responsive websites. (I'm currently using it now)
When you say "mobile devices", I'm assuming you're also talking about smartphones.
I would seriously advise against having fixed width items. The whole purpose of responsive design is to have elements of the page adjust to the width of your device.
You're going to need to break down your page by priority (perhaps remove unnecessary ads/fluff) and re-structure the layout accordingly.
For example: If this is a rental property search website, I would have the search bar prominently at the top and a list of results at the bottom. Perhaps remove the carousel for less distractions. It all depends on the goals of the website.