nostr:npub1kpwlxpzkxfmuxjmzc2wp3rf9vjg0sgydmlhsnrgqr3maf59h86qqdxxzz4 If I gather correctly, you are thinking of a construction that is loaded ~only in compression. Am I right?

What's the order of magnitude of the size you're thinking about (it's not obvious, because it depends on the angle in the pyramid's tip)? Less than 1% of Earth's mass/more than that?