If you read the PDF linked from that site, you'll see an amazing amount of work for such a young man. Seriously, this guy has put a ton of effort into this, addressing everything from materials, to construction, government, food, cost breakdown, to even a timeline for how long it will take. It may not be feasible and I'm sure there is a lot he hasn't thought of, but this man should be commended for what he's done. I'm impressed!