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Basically, I just want this for the outside.

There's no reason you couldn't install that outside, as long as you keep it covered when not in use.

It sounds like what you really need is a friend that is a metal fabricator. I have a friend that is a metal fabricator and also owns a machine shop. He might take it on for extra money. If you could have a four burner unit like this one: on a stand with a place to mount the tank underneath, would that be sufficient? Maybe with 12 inches of counter space on either side and a drip pan underneath?