Acquia Slate Front Preface Sidebar & Left Navigation Menu: Help with a desired change?

Edited

I'm building my first Drupal website (http://www.district-a-development.com/) with Acquia Slate for a local base artist community group. Two changes I'd like to implement involve 1. front preface sidebar along with the banner image on which the mission statement is placed and 2. the left navigation menu.

I want to remove the region for the "front preface sidebar" so that the left navigation go in place of the "front preface sidebar". Also I want to make the width of the big banner 715px instead of the default width 960px and has it float to the right so that the left navigation can push up replacing the front preface sidebar position. A picture is worth a thousand words so I have included an image of what i want, located at http://groups.drupal.org/node/23346#comment-86497.

The dev site is located at District-A Development site

If anyone can suggest how I might get this done, I'd be grateful. :)