The mantel is about 5' wide on the top shelf, the wall is about 68" wide. The mantel height is about 51" and the total wall height is about 11'.
Sadly, this mantel is not longer produced by the manufacturer, but they still make similar sizes. Check them out here: Fires of Tradition
The arched gas fireplace is still available, if you have a really good cabinet shop.
COASTROAD Hearth & Patio