Hey Wiley,
Your giving me some more good info,fist I thought about a large pipe cut into half,but I don't want a 1/2 round arch I want an elliptical arch which is more suitable for a barrel vault (correct me if I'm wrong) my legs on each side will come up 12'' and come up 10'' more in the center creating the barrel arch,I think this is proper for the size of my oven 4x6 deck.there is a company in Portland that will bend the steel for me and weld the back on , the front will have a smaller opening in it then welded on.then I will build brick hearth and chimney,then the task of covering the metal vault begins,what would you recommend I use to do that?thanks again for your help
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