All of these problems can be worked on in parallel, so I'm not sure why you think it would be "impossible" to do before 2030. Unlikely, sure. Also, Musk specif

All of these problems can be worked on in parallel, so I'm not sure why you think it would be "impossible" to do before 2030. Unlikely, sure. Also, Musk specifically mentioned that they weren't planning to use parachutes with this architecture, so you can scratch #9.