Topic List Previews Theme Component

Yes, you’d have to:

  • modify the maximum width of the standard topic list using CSS
    e.g:

    .wrap {
      max-width: 2000px;
    }
    
  • install something like the Layouts plugin to add the sidebars (but should work with other sidebar Components).

All relatively straightforward

However I’m not sure > 3 columns is very digestible and that includes sidebars?