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Can you also do that with an insulated shipping container?

You can solder join aluminium.

Don't go for aluminium alloys as they rust, pure aluminium is corrosion resistant.

You might get blueprints for this from Sir Peter.

104180

Maybe look up one notch further. If you build a self-contained motorhome your missus might like this better too. Depends if you have the skills required of course, but your skill set looks like in...