I was looking at the Firebox site and it looks like the little box adds a lot of support to the bottom. I'll be curious what the distance between the burner head and pot will end up being when you get that.

I still want to dig out my Hexagon and see if the remote canister stove will fit inside. If that fits, it should allow the bottle to be recessed into the cone, which would be very stable and concentrate the heat. I'll try to dig that all out this weekend.