Is there a summary somewhere of the milestones already passed and a schedule of the next milestones?
Closest you would get is the roadmap. Some broad timelines are known at this point, (mainly thanks to Charles his interviews).
This was very helpful. Thank you.
There are also all of the approved peer reviewed papers. These were not done all at once and each took a long time to process through a rather rigorous system. It is actually quite impressive if you look at the time span and the amount of papers that they had peer reviewed and approved. I believe they already have more papers peer reviews than the aircraft industry, prior to major transportation of people.