Fair enough. I don’t think it’s useful to build it, (I think it’s a stupid way for wanker money hoarders to buy recognition and fame), but we know how to pour concrete, we know how to install air conditioning, we know how to construct large buildings and make them habitable. Let me fall back on “English is my second language”; I think we both agree on the (lack of) usefulness of the project. I happen to think that it could be built (practical); or at least started, but that doesn’t make it a useful thing to build (practical). I don’t feel that I can clearly explain what I thought the word “practical” meant; but I didn’t mean to get into an argument about it.