I suggested to my dear wife lol… We buy the airstream and build a metal Quonset hut structure earth covered over it. In the right location it would be virtually invisible from the air and a winding driveway could be camouflaged to hide it from the road. A lot of square footage inside to conceal vehicles and equipment. It really depends if you could make it into a living space. Considering the way malls and homes for nouveau rich celebrities are produced today I think it’s quite possible. Deceptively simple in fact. Less than the cost of the airstream.