I'm trying to make the following modifications:

1. Display the shopping cart (not the sidebox) in the header and have it appear there at all times. When checkout button is clicked, standard ZC checkout functionality appears in main page area.

2. Change the look of the cart, as well as add some new totals at the bottom - 1) CA. Tax,2) Delivery Charge - currently this is configured as the "Best Way" Flat Rate Amount, and 3) a 20% Gratuity that gets calculated on the product pre-tax price.

Let's see if I have the correct files to edit:

- Language of Cart:
/includes/languages/english/custom/shopping_cart.php

- Design of Cart:
/includes/templates/custom/templates/tpl_shopping_cart_default.php

- Not Sure If I Need To Edit This File:
/includes/main_cart_actions.php

- Not Sure If I Need To Edit These Files:
/includes/modules/pages/shopping_cart/header_php.php
/includes/modules/pages/shopping_cart/jscript_main.php

A mock up of the new cart look can be seen on the website:

http://mobilebellboy.com/order/

Thanks for taking a look at this for me!