"Marvin the Martian" wrote in message
news
What you really want to do is... (wait for it) ... build a manufacturing
plant on Mars. Once on Mars, you can use Martian materials, so you don't
have to bring as much mass up.

Or the Moon - nearer to Earth; no atmosphere at all (compared to Mars) and
half the gravity of Mars. Also the Moon's closer to the Sun, so solar
energy can be used for smelting materials and industrial processes.