Still in the planning stage for my RF build, and the firebox will be 32"W x 24"H x 24" deep. Will I want to add some cross-braces to these 1/4" panels when I build this box? I've seen them with and without...I've noticed that a lot of the Lang units have braces on the panels, I assume for more strength and to prevent warpage from heat. Any info. would be greatly appreciated. Thank you all for your time!