Thanks for this article, amazing! It makes me wonder though why, if kinetic launch is a possibility, (coz I never guessed that) then wouldn't a giant electromagnet rail gun combined with a vacuum tube be a better solution? Say 10 kilometers of horizontal track gradually rising (like say, up a mountain) until the projectile is ejected vertically? You didn't spell it out but I'm guessing the acceleration required to achieve launch velocity to get to LEO would be unsurvivable for human crew?...