I found some old photos of what I was doing and attached one below. It is difficult to get any detail from them, because the whole area was wrapped in heavy-duty aluminum foil, and globbed with tons of silicone caulk. It is difficult to get oriented in the picture - look for the propane tanks and the rock guard to help with that. What I think I am seeing is that the sidewall and the front wall are framed with aluminum tube. 1x1? The front and side walls are joined together with what I call Z-brace - a strip of aluminum bent along the length into a Z-shape. Straight pieces of Z-brace are cut to needed length and lag screwed into the tubing above and below the curve, to bind the walls together. The pictures show the tubing and the Z-brace and lag screws. Unfortunately, you can't tell if there is any cross piece behind the curve, so I will take your word for its absence.
I guess my conclusion is that there is enough aluminum structure to hang the front crosswise cabinet properly. I can't believe it hangs solely from the inner skin. Finding that structure is another problem. Exploratory drilling would be messy, but will be covered once the cabinet is mounted.
Bill
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