I built one. i made a frame of wood then covered it in slate. the fire bowl is a reused bbq i made a manifold out of black iron pipe.
there is a air gap around the heat shield of the manifold. the bowl doesn't heat up the wood at all the bowl sits on thew slate.
the one thing i hate about this build is the stairs. if it was up to me i would have not put the stairs in at all (For security reasons) the stairs land right at curb! if you leave the door open people will walk right up to my bedroom :shocking:
Trust me you want one of these for your keys. you don't want to know why i say this.
Also i would suggest removing the red cords from your garage doors as well.