Done all three, in complete honesty. To be fair, you've left out * Just build your own furnaces and make your own glass [check] * Build your own aircraft [ch

Done all three, in complete honesty. To be fair, you've left out * Just build your own furnaces and make your own glass [check] * Build your own aircraft [check] * Fell trees for firewood and lumber [check] * Make your own spear and catch your own food [check] etc.