Yes, it is possible to just provide the fireplace and no insert. Contact Natural Concrete Products at 888-379-2210 and they can assist you in your order.
Hi Eric, Yes, there are different stone options as well as colors and you can see the links to our website for each below: Colors in the Random (also Panama series) - http://www.naturalconcreteproducts.com/products/fire-pit-kits/panama-collection/#product-item-3f3ff-d75c. Different face style Fossill (also Pantheon series) - http://www.naturalconcreteproducts.com/products/fire-pit-kits/pantheon-collection/#product-item-3d19d-803d. The back of the Grand Fireplace is tiered just like the front but without any openings so just a solid surface. If you would like more info please contact us at 888-379-2210. Thank you!
The bricks are included and the inside has a steel insert.
You can contact the manufacturer and discuss options here, 888-379-2210. The main issue is the steel insert is built to a specific height but could possibly be customized depending on your needs. Thank you!
The Grand Fireplace fire box dimensions are; 45" wide 30" high 34" deep Please call us at 888.379.2210 with any additional questions.
TOO heavy, this item weighs 6000 pounds.