No you're right. Stainless steel is insane, in those conditions it will corrode in several decades, if not faster. Foundation is just laughable, it won't last

No you're right. Stainless steel is insane, in those conditions it will corrode in several decades, if not faster. Foundation is just laughable, it won't last 200 years, much less 1000. Like you say, a structured pile of rocks with everything else easily replaceable is the recipe. The question actually should be not of a several truck hits, but of several fires, like, complete burnouts. That's what would happen in 1000 years.